US20080062905A1 - Method and system for reducing message instances - Google Patents
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- US20080062905A1 US20080062905A1 US11/942,350 US94235007A US2008062905A1 US 20080062905 A1 US20080062905 A1 US 20080062905A1 US 94235007 A US94235007 A US 94235007A US 2008062905 A1 US2008062905 A1 US 2008062905A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/02—Details
- H04L12/16—Arrangements for providing special services to substations
- H04L12/18—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast
- H04L12/189—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast in combination with wireless systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
- H04W4/08—User group management
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/12—Messaging; Mailboxes; Announcements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
- H04W48/12—Access restriction or access information delivery, e.g. discovery data delivery using downlink control channel
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/40—Connection management for selective distribution or broadcast
Definitions
- the present invention relates to the field of wireless communications. More particularly, the present invention relates to messaging within wireless transmission systems.
- Broadcast messages are transmitted at a specific time, on a specific channel, with a specific channelization code. Broadcast messages are only retransmitted if there is a problem with the robustness of delivery or timing (i.e., devices typically want to receive a message while being in the right place at the right time). Broadcast messages, however, are often transmitted over large geographical regions and therefore encompass a large number of cells. For this reason, broadcasting messages is only efficient where there will be a large number of users receiving the message.
- Multicasting where messages are sent to a predetermined number of users, involves limited receivers and selective transmissions to each of the targeted receivers.
- multiple instances of the same data i.e., message
- transmitting multiple instances of the same message is not an efficient use of radio resources. That is, with prior art multicast transmissions, messages and their associated pointers have a one-to-one correspondence which leads to multiple transmissions of the same message.
- Another approach is to assign a group identifier to a number of devices.
- the group identifier reduces one-to-one correspondence between messages and pointers and allows a single instance of a message to be received by each device having the assigned identifier.
- the group identifier approach is efficient only where there is prior knowledge of the devices that should form the group and the group identifier is expected to be used a number of times over a period of time.
- the group identifier must be established in the devices via offline or online programming, it is not an efficient means of ad hoc (ad hoc with respect to at least the wireless network) message delivery. That is, a group page from an email source may indeed be a repeating group, but the RF network will not have a priori knowledge of the repeating group.
- the present invention is a method and system for transmitting messages with reduced message instances. A determination is made as to whether there are multiple WTRUs identified for receipt of the same message. If so, a single instance of the message may be transmitted for all of the receiving WTRUs.
- FIG. 1 is a diagram illustrating a framed time sequence having a one-to-one correspondence between messages and pointers for a plurality of WTRUs receiving the same message in accordance with the prior art.
- FIG. 2 is a diagram showing a mobile network in which multiple WTRUs receive messages in accordance with the present invention.
- FIG. 3 is a diagram illustrating a framed time sequence wherein only a single instance of a message is transmitted despite the message being identified for delivery to a plurality of destination identifiers in accordance with the present invention.
- FIG. 4 is a diagram for more efficiently processing destination identifiers and pointers contained within a framed time sequence.
- FIG. 5 is a variation of the diagram shown in FIG. 4 wherein messages are included directly in the SIBs.
- FIG. 6 is a flow chart illustrating method steps implemented by a message arrival analysis routine in accordance with a preferred embodiment of the present invention.
- FIG. 7 is a flow chart illustrating method steps for periodically checking to see if there is a recipient list that has been in a multicast queue past a predetermined hold time in accordance with a preferred embodiment of the present invention.
- a wireless transmit/receive unit may have a transmit-only, a receive-only or a transmit and receive capability.
- An example would be a standard pager, which can receive but not transmit messages.
- a receive ability is important to the receipt of messages, in which case the particular unit would have at least a wireless receive function.
- a WTRU capable of both transmission and reception can generally be used to receive one-way messages. Therefore, for purposes of describing the invention, a WTRU may be any device capable of receiving and/or transmitting data in a wireless environment.
- FIG. 1 a diagram illustrating the manner in which multicast messages are transmitted according to the prior art is shown.
- a plurality of WTRUs 2 , 4 , 5 are identified, using unique destination identifiers, for receipt of the same message, message 1 .
- a separate instance of the message 1 is provided for each WTRU (see WTRU 2 and pointer 6 , WTRU 4 and pointer 8 , and WTRU 5 and pointer 9 ). Consequently, in FIG. 1 , there is a one-to-one correspondence between messages and pointers.
- destination identifiers are coordinated so that only a single instance of a message is used where the same message is being sent to more than one destination identifier (i.e. to more than one WTRU(s), depending on whether the destination identifier is associated with a single WTRU or a plurality of WTRUs).
- the mobile network 11 includes multiple base stations 12 , 13 which are responsive to a radio network controller (RNC) 14 , through one or more Node Bs 15 .
- RNC radio network controller
- a plurality of WTRUs 21 - 24 receive messages transmitted from the network.
- the base stations 12 , 13 transmit and receive signals via antennas 27 .
- the WTRUs 21 - 24 have receivers or transceivers which receive the signals from the base stations 12 , 13 (e.g., via antenna 28 of WTRU 21 ).
- the WTRUs 21 - 24 can be any of a number of devices supported by the system, such as a cell phone, pager, BlackberryTM device, or a computer with a modem connection.
- the base stations 12 , 13 are controlled by RNC 14 , which performs various network supervisory and communications functions.
- the base stations 12 , 13 provide transmit functions and signals that are transmitted to the WTRUs 21 - 24 within a respective cell or transmission area.
- a receive function is provided by each WTRU's RF stage in order to receive signals transmitted by the base stations 12 , 13 .
- each WTRU has both transmit and receive functions, permitting the WTRUs 21 - 24 to transmit data in an uplink and receive data in a downlink.
- WTRUs 21 and 22 the network will refrain from transmitting a plurality of instances of the same message. Instead, WTRUs 21 and 22 will be provided with message pointers that point to the same message. Each message pointer specifies a particular physical channel and time on/at which the message will be available.
- the network may detect such occurrences by evaluating a recipient list of a particular message and determining whether there are multiple WTRUs identified for receipt of a single message.
- WTRUs identified as being identified for receipt of a single message may be tracked using a message address status.
- the message address status may be WTRU specific and indicates whether a particular WTRU belongs to a group of WTRUs identified for receipt of the same message. Where there are multiple WTRUs ( 21 and 22 ) identified for receipt of the same message, a single instance of the message is transmitted to all of the receiving WTRUs.
- Other methods of determining and identifying which WTRUs are identified for receipt of the same message and are thus candidates for reduced message instances are within the scope of the invention and may be implemented as desired. Examples of such methods are described below.
- FIG. 3 is a diagram of an ordered frame having a timing sequence 40 showing a single instance of a message, message M, being transmitted to a plurality of destination identifiers 42 , 44 , and 46 .
- the destination identifiers 42 , 44 , and 46 may each be associated with one or more WTRUs.
- message “M” has been identified for delivery to the WTRU(s) associated with destination identifiers 42 , 44 , and 46 . That is, rather than providing multiple instances of message M, a single instance is provided thereby optimizing system resources.
- the message must occur in a fashion such that all of the WTRUs that are receiving the message will be able to receive the message during its transmission.
- the message transmission must be later than the last destination identifier time of transmission, and with sufficient time delay for every WTRU to prepare for the reception of the message.
- a pointer to a specific message may occur with any number of destination identifiers, and there may be intervening messages going to other WTRUs, as desired.
- one or more of the destination identifiers may actually be a group identifier of a number of WTRUs in a manner known to those skilled in the art of wireless technology.
- the determination of when it is feasible to use the same message multiple times according to the present invention may be refined and adapted, as desired. That is, the determination may be implemented in a variety of embodiments.
- the source of the messages can be programmed to associate multiple receiving WTRUs with the same message.
- the wireless network receives such a message it compares the recipient list against the coverage areas it has for them. Because of different locations or network affiliations it may be necessary to split the message and recipients into distinct transmissions. However if two or more of the receiving WTRUs are capable of receiving the same identification transmission and subsequently the same message transmission, then the solution of the present invention may be utilized.
- a second embodiment where messages and data concerning receiving WTRUs enter a wireless network individually, many types of messages can tolerate some delay in delivery without adverse effects.
- the system compares messages over some fraction of these allowable delay times for duplications. This can often be done with minimal calculations through such techniques as hashing functions.
- duplications are detected, a check is done to determine if any of the duplicated messages may be transmitted in a single transmission. If so, pointers that point to a single instance of a duplicated message is provided for the WTRUs identified for receipt of the duplicated message.
- a wireless system may include an entity for monitoring transmissions to WTRUs.
- the entity establishes a likelihood factor concerning whether certain groups of WTRUs receive transmissions of the same messages.
- the reception of a message for one of these WTRUs triggers a delay and search for duplications of the message for other devices before transmission thereof. If duplications are detected, a single instance of the message is transmitted. Otherwise, separate instances of the message are transmitted to each of the receiving WTRUs.
- a wireless system is preprogrammed to watch for specific device identifier groups and checks for duplication of messages to the individuals within these groups. If duplications are detected, a single instance of the message is transmitted. Otherwise, separate instances of the message are transmitted to each of the receiving WTRUs.
- the destination identifiers and pointers identified in FIG. 3 are signaled on the broadcast common control channel (BCCH) or an equivalent logical control channel broadcast to all users of the cell.
- BCCH broadcast common control channel
- the BCCH or equivalent logical control channel is mapped to a broadcast transport channel (BCH) or an equivalent broadcast transport channel that is applied to the primary common control physical channel (PCCPCH).
- PCCPCH primary common control physical channel
- the BCCH or an equivalent logical control channel can be mapped to a forward access channel (FACH) that is applied to the secondary common control physical channel (SCCPCH).
- FACH forward access channel
- a WTRU must check the entire timing sequence 40 to determine whether there is a message for them.
- SIB System Information Blocks
- the destination identifiers and pointers are associated with particular SIBs thereby allowing WTRU(s) to simply determine which individual SIB they should read in order to receive a message. That is, the list of destination identifiers and pointers can be relatively large. To avoid having a WTRU check each destination identifier and pointer contained within a timing sequence (such as timing sequence 40 ), the SIB information can be segmented into multiple independent transmissions. Alternatively, it is also possible to separate different classifications of destination identifiers and pointers into multiple SIBs.
- WTRUs may determine which SIB to read from a master information block (MIB) that identifies the scheduling of individual SIBs. That is, in this embodiment, instead of a WTRU checking all of the destination identifiers and pointers contained within a particular timing sequence (such as timing sequence 40 ), the WTRU may simply check the MIB to quickly determine the appropriate destination identifier and pointer (which are contained in the SIB). The destination identifiers and pointers are therefore associated with a particular SIB. Users may then only acquire SIBs for which services these users are associated with.
- MIB master information block
- FIG. 4 a MIB 502 including pointers 504 , 506 , and 508 is shown.
- the MIB may be unique for each cell. Therefore, each time a WTRU enters a cell, they will read the MIB. By reading the MIB 502 the WTRU is informed of where to find their SIB. The SIB informs the WTRU at which time interval the WTRU's destination identifier and pointer will be presented. It should also be noted that the destination identifier and pointer may be updated periodically. For example, in the case of stock quotes, a new message may be transmitted every 10 minutes. In that case, the WTRU will read the SIB every 10 minutes to receive the updated information, but does not have to read the MIB. This is because the MIB will not change unless the actual scheduling of the destination identifiers and pointers changes.
- the MIB 502 includes pointers 504 , 506 , and 508 which point to SIB 1 SIB 2 , and SIBN, respectively.
- a WTRU subscribing to service A reads the MIB, and is directed to SIB 1 510 . From reading SIB 1 510 , the WTRU reads the destination identifiers and pointers for service A 512 . The WTRU may then retrieve messages for service A. In this embodiment, any number of WTRUs may be associated with the destination identifiers for service A (i.e. all of the users subscribing to service A).
- WTRUs that subscribe to service A by reading the MIB and the SIB, are directed to a single instance of whatever message is being transmitted as part of service A.
- WTRUs associated with services B and X may similarly be directed to single instances of messages transmitted pursuant to those services.
- each WTRU reads MIB 601 and is directed to SIB 1 604 which includes a single instance of the message 602 currently being transmitted for service A.
- a generic message pointer such as a pointer to a message indicating availability of a more specific type of message.
- the user can then, either by preconfiguration or by selection at the time of receipt of the generic message, choose to receive the specific type message.
- the selection can be made to inform the network that the WTRU will receive the message, or the selection can be passive, allowing the WTRU to respond to the more specific message.
- a user entering a commercial space may be offered commercial information such that the user may elect to receive the commercial information.
- FIG. 6 is a flow chart illustrating method steps implemented by a message arrival analysis routine in accordance with a preferred embodiment of the present invention.
- a message arrival analysis routine When a message arrives, a determination is made as to whether the message is a duplicate of one for a pending recipient list (step 305 ).
- step 305 If the determination of step 305 yields a positive result, the WTRU(s) are added to the recipient list for the message (step 310 ). In step 315 , a determination is made as to whether the maximum hold time for this instance is less than that presently set for the recipient list. If it is, the hold time is adjusted to an appropriate value (step 320 ).
- step 305 determines whether the message can be delayed to search for other recipients (step 325 ). If the message can not be delayed to search for other recipients, a determination is made as to whether the message is being sent to more than one recipient (step 330 ). If the message is not being sent to more than one recipient, the message is scheduled for normal delivery (step 335 ). If the message is being sent to more than one recipient, or it is determined that the message can be delayed to search for other recipients, an entry is created in the recipient list queue, one or more WTRUs are added, and the hold time is set to an appropriate value (step 340 ).
- FIG. 7 is a flow chart illustrating method steps for periodically checking to see if there is a recipient list that has been in a multicast queue past a predetermined hold time in accordance with a preferred embodiment of the present invention.
- the WTRUs on the recipient list are segregated into groups in the same data delivery coverage areas (step 410 ).
- a determination is then made as to whether there is another group to send (step 415 ). If there is another group to send, the transmission of WTRU identifiers, message pointer and one instance of the message is scheduled (step 420 ). If there is not another group to send, the recipient list is deleted (step 425 ).
Abstract
A method and system for transmitting data with reduced message instances is disclosed. A wireless message network uses destination identifiers and message pointers to direct message data to multiple mobile units and avoid duplication of messages. In order to provide increased efficiency in the case of duplicate messages, a pointer to a message may be associated with multiple destination identifiers.
Description
- This application is a continuation of U.S. patent application Ser. No. 10/428,962 filed May 2, 2003, which claims the benefit of U.S. Provisional Application No. 60/378,718, filed on May 6, 2002, which are incorporated by reference as if fully set forth.
- The present invention relates to the field of wireless communications. More particularly, the present invention relates to messaging within wireless transmission systems.
- Messaging is an expanding part of wireless transmission systems. The prior art, however, fails to make efficient use of scarce radio resources with respect to the transmission of messages.
- In the case of general broadcasts, messages are transmitted at a specific time, on a specific channel, with a specific channelization code. Broadcast messages are only retransmitted if there is a problem with the robustness of delivery or timing (i.e., devices typically want to receive a message while being in the right place at the right time). Broadcast messages, however, are often transmitted over large geographical regions and therefore encompass a large number of cells. For this reason, broadcasting messages is only efficient where there will be a large number of users receiving the message.
- Multicasting, where messages are sent to a predetermined number of users, involves limited receivers and selective transmissions to each of the targeted receivers. In contrast to a broadcast message which is transmitted over large geographical regions, with multicasting, multiple instances of the same data (i.e., message) are transmitted, but only to the devices of the target group. Despite being more efficient than broadcasting, transmitting multiple instances of the same message is not an efficient use of radio resources. That is, with prior art multicast transmissions, messages and their associated pointers have a one-to-one correspondence which leads to multiple transmissions of the same message.
- Another approach is to assign a group identifier to a number of devices. The group identifier reduces one-to-one correspondence between messages and pointers and allows a single instance of a message to be received by each device having the assigned identifier. The group identifier approach, however, is efficient only where there is prior knowledge of the devices that should form the group and the group identifier is expected to be used a number of times over a period of time. Moreover, since the group identifier must be established in the devices via offline or online programming, it is not an efficient means of ad hoc (ad hoc with respect to at least the wireless network) message delivery. That is, a group page from an email source may indeed be a repeating group, but the RF network will not have a priori knowledge of the repeating group.
- Accordingly, a method and system is needed wherein a single message instance may be used for multiple recipients of the same message.
- The present invention is a method and system for transmitting messages with reduced message instances. A determination is made as to whether there are multiple WTRUs identified for receipt of the same message. If so, a single instance of the message may be transmitted for all of the receiving WTRUs.
-
FIG. 1 is a diagram illustrating a framed time sequence having a one-to-one correspondence between messages and pointers for a plurality of WTRUs receiving the same message in accordance with the prior art. -
FIG. 2 is a diagram showing a mobile network in which multiple WTRUs receive messages in accordance with the present invention. -
FIG. 3 is a diagram illustrating a framed time sequence wherein only a single instance of a message is transmitted despite the message being identified for delivery to a plurality of destination identifiers in accordance with the present invention. -
FIG. 4 is a diagram for more efficiently processing destination identifiers and pointers contained within a framed time sequence. -
FIG. 5 is a variation of the diagram shown inFIG. 4 wherein messages are included directly in the SIBs. -
FIG. 6 is a flow chart illustrating method steps implemented by a message arrival analysis routine in accordance with a preferred embodiment of the present invention. -
FIG. 7 is a flow chart illustrating method steps for periodically checking to see if there is a recipient list that has been in a multicast queue past a predetermined hold time in accordance with a preferred embodiment of the present invention. - The present invention will be described with reference to the drawing figures wherein like numerals represent like elements throughout. For purposes of describing the invention, a wireless transmit/receive unit (WTRU) may have a transmit-only, a receive-only or a transmit and receive capability. An example would be a standard pager, which can receive but not transmit messages. In the present invention, a receive ability is important to the receipt of messages, in which case the particular unit would have at least a wireless receive function. On the other hand, a WTRU capable of both transmission and reception can generally be used to receive one-way messages. Therefore, for purposes of describing the invention, a WTRU may be any device capable of receiving and/or transmitting data in a wireless environment.
- Referring now to
FIG. 1 , a diagram illustrating the manner in which multicast messages are transmitted according to the prior art is shown. InFIG. 1 a plurality ofWTRUs message 1. In the prior art, a separate instance of themessage 1 is provided for each WTRU (see WTRU 2 andpointer 6, WTRU 4 andpointer 8, and WTRU 5 and pointer 9). Consequently, inFIG. 1 , there is a one-to-one correspondence between messages and pointers. - According to the present invention, however, destination identifiers are coordinated so that only a single instance of a message is used where the same message is being sent to more than one destination identifier (i.e. to more than one WTRU(s), depending on whether the destination identifier is associated with a single WTRU or a plurality of WTRUs).
- Referring now to
FIG. 2 , amobile network 11 is shown. Themobile network 11 includesmultiple base stations more Node Bs 15. A plurality of WTRUs 21-24 receive messages transmitted from the network. Thebase stations antennas 27. The WTRUs 21-24 have receivers or transceivers which receive the signals from thebase stations 12, 13 (e.g., viaantenna 28 of WTRU 21). - The WTRUs 21-24 can be any of a number of devices supported by the system, such as a cell phone, pager, Blackberry™ device, or a computer with a modem connection. The
base stations base stations base stations - Where the network detects a single message identified for delivery to a plurality of WTRUs, say, for example, WTRUs 21 and 22, the network will refrain from transmitting a plurality of instances of the same message. Instead, WTRUs 21 and 22 will be provided with message pointers that point to the same message. Each message pointer specifies a particular physical channel and time on/at which the message will be available.
- The network may detect such occurrences by evaluating a recipient list of a particular message and determining whether there are multiple WTRUs identified for receipt of a single message. WTRUs identified as being identified for receipt of a single message may be tracked using a message address status. The message address status may be WTRU specific and indicates whether a particular WTRU belongs to a group of WTRUs identified for receipt of the same message. Where there are multiple WTRUs (21 and 22) identified for receipt of the same message, a single instance of the message is transmitted to all of the receiving WTRUs. Other methods of determining and identifying which WTRUs are identified for receipt of the same message and are thus candidates for reduced message instances, are within the scope of the invention and may be implemented as desired. Examples of such methods are described below.
-
FIG. 3 is a diagram of an ordered frame having atiming sequence 40 showing a single instance of a message, message M, being transmitted to a plurality ofdestination identifiers destination identifiers - There is a general restriction when implementing this approach that the message must occur in a fashion such that all of the WTRUs that are receiving the message will be able to receive the message during its transmission. By way of example, the message transmission must be later than the last destination identifier time of transmission, and with sufficient time delay for every WTRU to prepare for the reception of the message.
- It is important to note that the use of a pointer to a specific message may occur with any number of destination identifiers, and there may be intervening messages going to other WTRUs, as desired. Furthermore, as mentioned, one or more of the destination identifiers may actually be a group identifier of a number of WTRUs in a manner known to those skilled in the art of wireless technology.
- The determination of when it is feasible to use the same message multiple times according to the present invention may be refined and adapted, as desired. That is, the determination may be implemented in a variety of embodiments.
- By way of example, in a first embodiment, the source of the messages can be programmed to associate multiple receiving WTRUs with the same message. Using an email message having multiple recipients as an example, when the wireless network receives such a message it compares the recipient list against the coverage areas it has for them. Because of different locations or network affiliations it may be necessary to split the message and recipients into distinct transmissions. However if two or more of the receiving WTRUs are capable of receiving the same identification transmission and subsequently the same message transmission, then the solution of the present invention may be utilized.
- In a second embodiment, where messages and data concerning receiving WTRUs enter a wireless network individually, many types of messages can tolerate some delay in delivery without adverse effects. In this case, the system compares messages over some fraction of these allowable delay times for duplications. This can often be done with minimal calculations through such techniques as hashing functions. When duplications are detected, a check is done to determine if any of the duplicated messages may be transmitted in a single transmission. If so, pointers that point to a single instance of a duplicated message is provided for the WTRUs identified for receipt of the duplicated message.
- In a third embodiment, a wireless system may include an entity for monitoring transmissions to WTRUs. The entity establishes a likelihood factor concerning whether certain groups of WTRUs receive transmissions of the same messages. The reception of a message for one of these WTRUs triggers a delay and search for duplications of the message for other devices before transmission thereof. If duplications are detected, a single instance of the message is transmitted. Otherwise, separate instances of the message are transmitted to each of the receiving WTRUs.
- In a fourth embodiment, a wireless system is preprogrammed to watch for specific device identifier groups and checks for duplication of messages to the individuals within these groups. If duplications are detected, a single instance of the message is transmitted. Otherwise, separate instances of the message are transmitted to each of the receiving WTRUs.
- To implement the present invention in 3rd generation (3GPP) cellular networks, the destination identifiers and pointers identified in
FIG. 3 are signaled on the broadcast common control channel (BCCH) or an equivalent logical control channel broadcast to all users of the cell. The BCCH or equivalent logical control channel is mapped to a broadcast transport channel (BCH) or an equivalent broadcast transport channel that is applied to the primary common control physical channel (PCCPCH). Alternatively, the BCCH or an equivalent logical control channel can be mapped to a forward access channel (FACH) that is applied to the secondary common control physical channel (SCCPCH). - In
FIG. 3 , a WTRU must check theentire timing sequence 40 to determine whether there is a message for them. To provide more efficient processing and reduced battery consumption in a WTRU, it is necessary to provide deterministic scheduling of the destination identifiers and pointers. Furthermore, it is necessary to signal logically separate information (i.e. the destination identifiers and pointers) independently since the need to acquire the information and the periodicity of signaling will be unique to the signaling information being signaled. Therefore, in another embodiment of the present invention, the destination identifiers and pointers are maintained in unique System Information Blocks (SIB). In this embodiment, therefore, the destination identifiers and pointers are associated with particular SIBs thereby allowing WTRU(s) to simply determine which individual SIB they should read in order to receive a message. That is, the list of destination identifiers and pointers can be relatively large. To avoid having a WTRU check each destination identifier and pointer contained within a timing sequence (such as timing sequence 40), the SIB information can be segmented into multiple independent transmissions. Alternatively, it is also possible to separate different classifications of destination identifiers and pointers into multiple SIBs. - WTRUs may determine which SIB to read from a master information block (MIB) that identifies the scheduling of individual SIBs. That is, in this embodiment, instead of a WTRU checking all of the destination identifiers and pointers contained within a particular timing sequence (such as timing sequence 40), the WTRU may simply check the MIB to quickly determine the appropriate destination identifier and pointer (which are contained in the SIB). The destination identifiers and pointers are therefore associated with a particular SIB. Users may then only acquire SIBs for which services these users are associated with.
- To illustrate this embodiment, reference is made to
FIG. 4 . InFIG. 4 , aMIB 502 includingpointers MIB 502 the WTRU is informed of where to find their SIB. The SIB informs the WTRU at which time interval the WTRU's destination identifier and pointer will be presented. It should also be noted that the destination identifier and pointer may be updated periodically. For example, in the case of stock quotes, a new message may be transmitted every 10 minutes. In that case, the WTRU will read the SIB every 10 minutes to receive the updated information, but does not have to read the MIB. This is because the MIB will not change unless the actual scheduling of the destination identifiers and pointers changes. - For example, still referring to
FIG. 4 , theMIB 502 includespointers SIB1 510. From readingSIB1 510, the WTRU reads the destination identifiers and pointers for service A 512. The WTRU may then retrieve messages for service A. In this embodiment, any number of WTRUs may be associated with the destination identifiers for service A (i.e. all of the users subscribing to service A). Therefore all of the WTRUs that subscribe to service A, by reading the MIB and the SIB, are directed to a single instance of whatever message is being transmitted as part of service A. WTRUs associated with services B and X may similarly be directed to single instances of messages transmitted pursuant to those services. - The embodiment discussed above and shown in
FIG. 4 may be varied so that the actual message is included in the SIB, as shown inFIG. 5 . InFIG. 5 , a WTRU reads the MIB as before, but here an extra step is eliminated because when the WTRU obtains its SIB it has an actual message. This also enables a single instance of the message to be transmitted for multiple WTRUs. That is, each WTRU readsMIB 601 and is directed to SIB1 604 which includes a single instance of themessage 602 currently being transmitted for service A. - It should be noted that it is possible to provide multiple levels of pointers and messages. Thus, it is possible to include a generic message pointer, such as a pointer to a message indicating availability of a more specific type of message. The user can then, either by preconfiguration or by selection at the time of receipt of the generic message, choose to receive the specific type message. The selection can be made to inform the network that the WTRU will receive the message, or the selection can be passive, allowing the WTRU to respond to the more specific message. By way of example, a user entering a commercial space may be offered commercial information such that the user may elect to receive the commercial information.
-
FIG. 6 is a flow chart illustrating method steps implemented by a message arrival analysis routine in accordance with a preferred embodiment of the present invention. When a message arrives, a determination is made as to whether the message is a duplicate of one for a pending recipient list (step 305). - If the determination of
step 305 yields a positive result, the WTRU(s) are added to the recipient list for the message (step 310). Instep 315, a determination is made as to whether the maximum hold time for this instance is less than that presently set for the recipient list. If it is, the hold time is adjusted to an appropriate value (step 320). - If the determination of
step 305 yields a negative result, a determination is made as to whether the message can be delayed to search for other recipients (step 325). If the message can not be delayed to search for other recipients, a determination is made as to whether the message is being sent to more than one recipient (step 330). If the message is not being sent to more than one recipient, the message is scheduled for normal delivery (step 335). If the message is being sent to more than one recipient, or it is determined that the message can be delayed to search for other recipients, an entry is created in the recipient list queue, one or more WTRUs are added, and the hold time is set to an appropriate value (step 340). -
FIG. 7 is a flow chart illustrating method steps for periodically checking to see if there is a recipient list that has been in a multicast queue past a predetermined hold time in accordance with a preferred embodiment of the present invention. When it is determined that a recipient list remains in the multicast queue past its hold time (step 405), the WTRUs on the recipient list are segregated into groups in the same data delivery coverage areas (step 410). A determination is then made as to whether there is another group to send (step 415). If there is another group to send, the transmission of WTRU identifiers, message pointer and one instance of the message is scheduled (step 420). If there is not another group to send, the recipient list is deleted (step 425). - While the present invention has been described in terms of the preferred embodiment, other variations which are within the scope of the invention as outlined in the claims below will be apparent to those skilled in the art.
Claims (20)
1. A method for transmitting messages in a wireless communication network, the method comprising:
receiving a new message for transmission to a destination wireless transmit/receive unit (WTRU);
determining whether the new message is identical to a pending message that is awaiting transmission to another WTRU;
adding the destination WTRU to a list of WTRUs identified for receipt of the pending message when the determination is positive;
providing all WTRUs on the list with a transmission schedule indicating when the pending message will be transmitted; and
transmitting a single instance of the pending message at a time indicated by the transmission schedule.
2. The method of claim 1 further comprising:
adjusting the transmission schedule of the pending message in accordance with a maximum allowable delay of the new message.
3. The method of claim 1 wherein the transmission schedule includes a plurality of system information blocks (SIBs).
4. The method of claim 3 wherein the transmission schedule includes a master information block (MIB) and a plurality of SIB pointers, each SIB pointer indicating where to find a corresponding SIB.
5. The method of claim 4 wherein the transmission schedule is provided periodically whereby a WTRU detects a SIB periodically and only reads the MIB when the transmission schedule for the SIB changes.
6. The method of claim 4 wherein the SIB contains data messages.
7. The method of claim 4 further comprising:
receiving an indication of receipt from a WTRU after the WTRU detects an existence of a message based on the MIB.
8. A network station for transmitting messages in a wireless communication network, the network station comprising:
a processor configured to determine whether a new message to be transmitted to a destination wireless transmit/receive unit (WTRU) is identical to a pending message that is awaiting transmission, and when the determination is positive to add the destination WTRU to a list of WTRUs identified for receipt of the pending message; and
a transmitter configured to provide a transmission schedule to all WTRUs on the list indicating when the pending message will be transmitted to said WTRUs, and to transmit a single instance of the pending message at a time indicated by the transmission schedule.
9. The network station of claim 8 wherein the transmitter is further configured to adjust the transmission schedule of the pending message in accordance with a maximum allowable delay of the new message.
10. The network station of claim 8 wherein the transmission schedule includes a plurality of system information blocks (SIBs) for informing the WTRUs of the transmission schedule of the pending message.
11. The network station of claim 10 wherein the transmission schedule includes a master information block (MIB) including a plurality of SIB pointers to all WTRUs on the list, each SIB pointer indicating where to find the corresponding SIB.
12. The network station of claim 11 wherein the transmission schedule is transmitted periodically such that a WTRU detects a SIB periodically and only detects the MIB when the transmission schedule for the SIB changes.
13. The network station of claim 11 wherein the transmitter is configured to transmit data messages in the SIB.
14. A wireless transmit/receive unit (WTRU) for receiving messages in a wireless communication system, the WTRU comprising:
a receiver configured to receive a transmission schedule indicating the WTRU is identified for receipt of a message and when the pending message will be transmitted to the WTRU, wherein the transmission schedule identified all WTRUs identified for receipt of the pending message, and to receive the pending message where indicated by the transmission schedule.
15. The WTRU of claim 14 , wherein the transmission schedule received by the WTRU accounts for a maximum allowable delay of the pending message.
16. The WTRU of claim 14 , wherein the transmission schedule received by the WTRU includes a plurality of system information blocks (SIBs).
17. The WTRU of claim 16 , wherein the transmission schedule received by the WTRU includes a master information block (MIB) and a plurality of SIB pointers, each SIB pointer indicating where to find a corresponding SIB.
18. The WTRU of claim 17 , wherein the transmission schedule received by the WTRU is provided periodically whereby a WTRU detects a SIB periodically and only reads the MIB when the transmission schedule for the SIB changes.
19. The WTRU of claim 17 , wherein the SIB contains data.
20. The WTRU of claim 14 , further comprising:
a transmitter configured to transmit an indication of receipt after the WTRU detects an existence of a message based on the MIB.
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US20040002342A1 (en) | 2004-01-01 |
MXPA04011050A (en) | 2005-02-14 |
KR20060082085A (en) | 2006-07-14 |
CN1849831A (en) | 2006-10-18 |
JP2006074813A (en) | 2006-03-16 |
AU2003241355B8 (en) | 2009-08-06 |
JP2006511981A (en) | 2006-04-06 |
WO2003096717A1 (en) | 2003-11-20 |
EP1502461A4 (en) | 2005-06-22 |
TW200501761A (en) | 2005-01-01 |
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