WO2010111925A1 - 多媒体广播多播业务控制信令的传输方法和系统 - Google Patents

多媒体广播多播业务控制信令的传输方法和系统 Download PDF

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Publication number
WO2010111925A1
WO2010111925A1 PCT/CN2010/071324 CN2010071324W WO2010111925A1 WO 2010111925 A1 WO2010111925 A1 WO 2010111925A1 CN 2010071324 W CN2010071324 W CN 2010071324W WO 2010111925 A1 WO2010111925 A1 WO 2010111925A1
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WIPO (PCT)
Prior art keywords
radio frame
mbms control
control channel
subframe
terminal
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PCT/CN2010/071324
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English (en)
French (fr)
Inventor
苟伟
马子江
Original Assignee
中兴通讯股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 中兴通讯股份有限公司 filed Critical 中兴通讯股份有限公司
Priority to KR1020117019780A priority Critical patent/KR101350962B1/ko
Priority to JP2012501124A priority patent/JP5461681B2/ja
Priority to EP10758027.6A priority patent/EP2416536B1/en
Priority to MX2011010028A priority patent/MX2011010028A/es
Priority to US13/202,745 priority patent/US8582487B2/en
Publication of WO2010111925A1 publication Critical patent/WO2010111925A1/zh
Priority to HK12104408.4A priority patent/HK1163972A1/xx

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00Data switching networks
    • H04L12/02Details
    • H04L12/16Arrangements for providing special services to substations
    • H04L12/18Arrangements for providing special services to substations for broadcast or conference, e.g. multicast
    • H04L12/189Arrangements for providing special services to substations for broadcast or conference, e.g. multicast in combination with wireless systems
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/003Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053Allocation of signaling, i.e. of overhead other than pilot signals
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L51/00User-to-user messaging in packet-switching networks, transmitted according to store-and-forward or real-time protocols, e.g. e-mail
    • H04L51/58Message adaptation for wireless communication
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/60Network streaming of media packets
    • H04L65/61Network streaming of media packets for supporting one-way streaming services, e.g. Internet radio
    • H04L65/611Network streaming of media packets for supporting one-way streaming services, e.g. Internet radio for multicast or broadcast
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W28/00Network traffic management; Network resource management
    • H04W28/02Traffic management, e.g. flow control or congestion control
    • H04W28/06Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W4/00Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/06Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W48/00Access restriction; Network selection; Access point selection
    • H04W48/08Access restriction or access information delivery, e.g. discovery data delivery
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management
    • H04W72/20Control channels or signalling for resource management
    • H04W72/23Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • H04W72/231Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal the control data signalling from the layers above the physical layer, e.g. RRC or MAC-CE signalling
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management
    • H04W72/20Control channels or signalling for resource management
    • H04W72/23Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management
    • H04W72/30Resource management for broadcast services

Definitions

  • the present invention relates to a broadcast transmission technology in a Long Term Evolution (LTE) system, and more particularly to a method and system for transmitting Multimedia Broadcast Multicast Service (MBMS) control signaling.
  • LTE Long Term Evolution
  • MBMS Multimedia Broadcast Multicast Service
  • MBMS Multimedia Broadcast Multicast Service
  • 3GPP 3rd Generation Partnership Project
  • 3rd Generation Partnership Project 3rd Generation Partnership Project
  • MBMS Multimedia Broadcast Multicast Service
  • the service is a technology for transmitting data from one data source to multiple targets, realizing the sharing of resources of the network (including the core network and the access network), and improving the utilization of network resources, especially air interface resources.
  • MBMS defined by 3GPP can not only realize plain text low-rate message class multicast and broadcast, but also realize multicast and broadcast of high-speed multimedia services, and provide a variety of rich multimedia services such as video and audio.
  • MBMS services can be transmitted using a hybrid carrier.
  • the hybrid carrier means that the unicast service (Unicast) and the multicast service (MBMS) are transmitted on the same carrier in a time division multiplexing manner, and the minimum unit of time division multiplexing is a subframe.
  • the radio frame used to carry the MBMS service in LTE satisfies the following relationship:
  • radioFrameAllocationPeriod radioFrameAllocationOffset
  • SFN System Frame Number
  • the radioFrameAllocationPeriod indicates the multimedia broadcast multicast service single frequency network.
  • the maximum system frame number in LTE that is, the system is the number of the radio frame) is 1023.
  • radioFrameAllocationOffset indicates the offset of the MBSFN radio frame, which is greater than or equal to An integer of 0 and less than the value of the selected MBSFN radio frame period; mod indicates the modulo operation of the SFN on the radioFrameAllocationPeriod.
  • SIB2 System Information Block Type 2
  • the obtained MBSFN radio frame is as shown in FIG. 1, and the shaded part in the figure indicates the MBSFN radio frame configured by the system.
  • the MBSFN radio frame is a radio frame used to carry MBMS services. Further, the system configures, on the MBSFN radio frame, those subframes that are 7-bit MBMS services, which are called MBSFN subframes. Both MBSFN frames and MBSFN subframes are referred to as MBSFN resources; these MBSFN resources constitute a Multicast Channel (MCH) transport channel.
  • MCH Multicast Channel
  • the MBMS multicast control channel MCCH Multicast Control Channel
  • P-MCCH Primary multicast control channel
  • S-MCCH Secondary multicast control channel
  • MCCH Control Channel
  • MCCH Control Channel
  • the LTE disclosed technology also specifies that one or two P-MCCH scheduling information may be indicated on a System Broadcast Message (BCCH, Broadcast Control Channel), and one is transmitted in a single-cell mode on a downlink shared channel (DL-SCH, Downlink Shared Channel). On, one is transmitted on the MCH for multi-cell mode.
  • the P-MCCH carries control signaling related to the MBSFN area service, and the signaling is used to indicate which valid MBMS and other messages are in the area. Interest. If necessary, the P-MCCH can also carry the S-MCCH indication information to help discover the S-MCCH.
  • the MBMS service is divided into a single cell mode and a multi-cell mode
  • the P-MCCH is also divided into a single cell mode and a multi-cell mode.
  • One of the main features of the single cell mode is that multi-cell MBSFN combining is not supported, and the multi-cell mode must support multi-cell MBSFN combining.
  • MCCH may no longer support MBSFN merging, regardless of the primary and secondary structure.
  • the P-MCCH transmitted in the multi-cell mode must be carried on the multicast resource composed of the multicast frame, and the S-MCCH is also transmitted in the multi-cell mode, and also carries the multicast composed of the multicast frame. Resources. If the MCCH is no longer in the primary-sequence structure and the multi-cell mode transmission is not performed, the MCCH itself may be carried on the unicast resource, that is, on the DL-SCH, or may be carried on the multicast resource formed by the multicast frame, that is, On the MCH.
  • the transmission on the system side is very random. That is to say, the terminal is required to receive the MBMS control channel (including: P-MCCH, S-MCCH, and MCCH) very frequently, so that the reception of the terminal also brings randomness, resulting in a large signaling overhead. It is not convenient for the terminal to save power. Summary of the invention
  • the main purpose of the present invention is to provide a transmission method and system for MBMS control signaling, so as to eliminate the randomness of transmitting MBMS control signaling on the system side and receiving MBMS control signaling by the terminal, and reducing the signaling overhead of the terminal.
  • the present invention provides a method for transmitting MBMS control signaling, the method comprising: transmitting, by a network side, indication information of a radio frame and/or a subframe carrying an MBMS control channel to a terminal by using high layer signaling, and transmitting the MBMS through the bearer Radio frame and/or subframe direction of the control channel
  • the terminal sends MBMS control signaling;
  • the MBMS control channel is: a multicast control channel (MCCH), or a primary multicast control channel (P-MCCH), or a secondary multicast control channel (S-MCCH), or a multicast indication channel (MICH) or multicast.
  • Transport Channel MTCH
  • the indication information of the radio frame and/or the subframe that carries the MBMS control channel includes at least one of the following:
  • the indication information of the radio frame and/or the subframe that carries the MBMS control channel further includes: an MBSFN radio frame period and an MBSFN radio frame offset.
  • radioFrameAllocationPeriod radioFrameAllocationOffset parses the radio frame carrying the MBMS control channel; where SFN indicates the system frame number, which is a positive integer; radioFrameAllocationPeriod indicates the MBSFN radio frame period; radioFrameAllocationOffset indicates the MBSFN radio frame offset, which is greater than or equal to An integer of 0 and less than the value of radioFrameAllocationPeriod; PmcchPeriod indicates the bearer The period information of the radio frame and/or sub-frame of the MBMS control channel is an integer greater than or equal to the radioFrameAllocationPeriod; PmcchOffset indicates the transmission offset information of the radio frame and/or subframe carrying the MBMS control channel, relative to the SFN.
  • the method further includes at least one of the following steps:
  • the network side implicitly notifies the terminal of the transmission offset by the MBSFN radio frame offset according to the preset correspondence between the transmission offset and the MBSFN radio frame offset;
  • the network side implicitly notifies the terminal of the repetition period through the MBSFN radio frame period according to the preset correspondence between the repetition period and the MBSFN radio frame period;
  • the network side implicitly notifies the terminal to the terminal by using a repetition period according to a preset correspondence between the repetition period and the modification period;
  • the network side implicitly notifies the terminal of the repetition period through the modification period according to the preset correspondence between the repetition period and the modification period.
  • the indication information that the network side sends the radio frame and/or the subframe that carries the MBMS control channel to the terminal by using the high layer signaling is:
  • the network side is configured to notify the radio frame information of the MBMS control channel by using the high layer signaling, and further, in a manner of using a bitmap by the high layer signaling, or indicating the subframe number by using the high layer signaling, or fixed.
  • the manner of the subframe indicates to the terminal the subframe information of the MBMS control channel carrying the MBMS control channel and specifically carrying the MBMS control channel.
  • the high layer signaling is a system broadcast message, or a radio resource control (RRC) message, or dedicated signaling.
  • RRC radio resource control
  • the present invention also provides a method for transmitting MBMS control signaling, the method comprising: the network side carrying a radio frame and/or a subframe of the MBMS control channel by using high layer signaling
  • the indication information is sent to the terminal, and the MBMS control signaling is sent to the terminal through the radio frame and/or subframe carrying the MBMS control channel.
  • the MBMS control channel is: MCCH, or P-MCCH, or S-MCCH, or MICH, or MTCH.
  • the indication information of the radio frame and/or the subframe that carries the MBMS control channel includes at least one of the following:
  • the indication information of the radio frame and/or the subframe that carries the MBMS control channel further includes: an MBSFN radio frame period and an MBSFN radio frame offset.
  • the method further includes at least one of the following steps:
  • the network side implicitly notifies the terminal of the transmission offset by the MBSFN radio frame offset according to the preset correspondence between the transmission offset and the MBSFN radio frame offset;
  • the network side implicitly notifies the terminal of the repetition period through the MBSFN radio frame period according to the preset correspondence between the repetition period and the MBSFN radio frame period;
  • the network side implicitly notifies the terminal to the terminal by using a repetition period according to a preset correspondence between the repetition period and the modification period;
  • the network side implicitly notifies the terminal of the repetition period through the modification period according to the preset correspondence between the repetition period and the modification period.
  • the network side notifies the terminal of the radio frame information of the MBMS control channel by using the high layer signaling, and further indicates the bearer to the terminal by means of a bitmap, a method of indicating a subframe number, or a fixed subframe.
  • the subframe information of the MBMS control channel that specifically carries the MBMS control channel in the radio frame of the MBMS control channel.
  • the high layer signaling is a system broadcast message, or an RRC message, or dedicated signaling.
  • the present invention also provides a method for transmitting MBMS control signaling, the method includes: the terminal acquiring, by using the high layer signaling, indication information of a radio frame and/or a subframe that carries the MBMS control channel from the network side;
  • the MBMS control channel is: MCCH, or P-MCCH, or S-MCCH, or MICH, or MTCH.
  • the indication information of the radio frame and/or the subframe that carries the MBMS control channel includes at least one of the following:
  • the indication information of the radio frame and/or the subframe that carries the MBMS control channel further includes: an MBSFN radio frame period and an MBSFN radio frame offset.
  • radioFrameAllocationPeriod radioFrameAllocationOffset parses the radio frame carrying the MBMS control channel; where SFN indicates the system frame number, which is a positive integer; radioFrameAllocationPeriod indicates the MBSFN radio frame period; radioFrameAllocationOffset indicates the MBSFN radio frame offset, which is greater than or equal to An integer of 0, which is smaller than the value of radioFrameAllocationPeriod; PmcchPeriod indicates the period of occurrence of radio frames and/or subframes carrying the MBMS control channel, which is an integer greater than or equal to radioFrameAllocationPeriod; PmcchOffset indicates the radio frame of the MBMS control channel.
  • the high layer signaling is a system broadcast message, or an RRC message, or dedicated signaling.
  • the present invention also provides a transmission system for MBMS control signaling, where the system includes a connected network side and a terminal, where
  • the network side is configured to send, by using the high layer signaling, indication information of the radio frame and/or the subframe that carries the MBMS control channel to the terminal, and to the radio frame and/or subframe that carries the MBMS control channel to the The terminal sends MBMS control signaling;
  • the terminal is configured to parse a radio frame and/or a subframe that carries the MBMS control channel according to the obtained indication information of the radio frame and/or the subframe, and read from the radio frame and/or the subframe. Take MBMS control signaling.
  • the MBMS control channel is: MCCH, or P-MCCH, or S-MCCH, or MICH, or MTCH.
  • the indication information of the radio frame and/or subframe that carries the MBMS control channel includes at least one of the following: And including period information and transmission offset information of a radio frame and/or a subframe that carries an MBMS control channel;
  • the indication information of the radio frame and/or the subframe that carries the MBMS control channel further includes: an MBSFN radio frame period and an MBSFN radio frame offset.
  • the method and system for transmitting MBMS control signaling provided by the present invention, the network side sends the indication information of the radio frame and/or the subframe carrying the MBMS control channel to the terminal through the high layer signaling; the terminal according to the acquired radio frame and/or The indication information of the subframe parses the radio frame and/or subframe carrying the MBMS control channel, and reads the MBMS control signaling from the radio frame and/or the subframe.
  • the invention solves the problem that the MBMS control channel is configured on the system side, and provides a method for the MBMS control signaling transmission, which eliminates the randomness of the system side transmitting the MBMS control signaling and the terminal receiving the MBMS control signaling with a small signaling overhead.
  • the indication information of the radio frame and/or the subframe that carries the MBMS control channel in the present invention can be flexibly configured, which provides flexibility for the network side to send MBMS control signaling; the present invention carries the MBMS control channel.
  • the sub-frames can be flexibly selected to facilitate scheduling on the network side.
  • FIG. 1 is a schematic diagram of a configuration of an MBSFN radio frame in the prior art
  • FIG. 2 is a flowchart of a method for transmitting MBMS control signaling according to the present invention
  • FIG. 3 is a schematic diagram of a radio frame used to carry an MBMS according to an embodiment of the present invention.
  • FIG. 4 is a schematic diagram 1 of a radio frame carrying an MBMS control channel according to an embodiment of the present invention
  • FIG. 5 is a schematic diagram 2 of a radio frame carrying an MBMS control channel according to an embodiment of the present invention
  • FIG. 6 is a schematic diagram of a radio bearer carrying an MBMS control channel according to an embodiment of the present invention
  • Frame diagram three is a schematic diagram of a radio frame carrying an MBMS control channel according to an embodiment of the present invention
  • FIG. 8 is a schematic diagram of a radio frame carrying an MBM S control channel according to an embodiment of the present invention
  • FIG. 9 is a schematic diagram of a radio bearer carrying an MBMS control channel according to an embodiment of the present invention
  • FIG. 10 is a schematic structural diagram of a transmission system of an MBMS control signaling according to the present invention. detailed description
  • a method for transmitting MBMS control signaling provided by the present invention mainly includes the following steps:
  • Step 201 The network side sends the indication information of the radio frame and/or the subframe that carries the MBMS control channel to the terminal by using the high layer signaling, and sends the MBMS control signaling to the terminal by using the radio frame and/or the subframe that carries the MBMS control channel.
  • the network side of the present invention may be a base station (eNB), or a Mobility Management Entity (MME), or a gateway (Get-way), or an Evolved Packet System (EPS), or a multi-point collaboration entity ( MCE, Multi-cell/Multicast Coordination Entity), etc.
  • eNB base station
  • MME Mobility Management Entity
  • EPS Evolved Packet System
  • MCE multi-point collaboration entity
  • MCE Multi-cell/Multicast Coordination Entity
  • the MBMS control channel referred to in the present invention may be either the P-MCCH and the S-MCCH described in the LTE disclosed technology, the MCCH described in the LTE disclosed technology, or the MICH (Multicast Indicator). Channel ), can also be other channels, such as: Multicast Transport Channel (MTCH, Multicast Traffic Channel) and so on.
  • MTCH Multicast Transport Channel
  • MBMS control channel in the present invention is not limited to the above, and may be extended according to actual needs.
  • the indication information of the radio frame and/or the subframe that carries the MBMS control channel that the eNB sends to the terminal through the high layer signaling is specifically: the radio frame carrying the MBMS control channel can be indicated only to the terminal, and those in the radio frame are If the frame carries the MBMS control channel, the fixed subframe that the eNB and the terminal have previously negotiated may be selected, or the terminal blindly detects the wireless carrying the MBMS control channel.
  • the eNB only needs to send the indication information of the radio frame carrying the MBMS control channel to the terminal; the eNB may also only indicate the subframe carrying the MBMS control channel to the terminal, and the radio frame carrying the MBMS control channel may Selecting a fixed radio frame that is pre-negotiated by the eNB and the terminal, or the terminal blindly detecting the fixed subframe on each radio frame, so the eNB only needs to send the indication information of the subframe that carries the MBMS control channel to the terminal; the eNB can also simultaneously send the terminal to the terminal.
  • the radio frame and the subframe carrying the MBMS control channel are indicated, so that the indication information of the radio frame and the subframe carrying the MBMS control channel needs to be transmitted to the terminal.
  • the bitmap when the eNB notifies the indication information of the subframe, the bitmap may be in the form of a bitmap, or the manner of indicating the subframe number, or the manner of the fixed subframe, to indicate to the terminal that the radio bearer carrying the MBMS control channel carries the MBMS. Subframe information of the control channel.
  • the indication information of the radio frame and/or the subframe that carries the MBMS control channel includes at least one of the following:
  • transmission offset information including control signaling carried on radio frames and/or subframes of the MBMS control channel; Repetition period information and modification period information of control signaling carried on radio frames and/or subframes of the MBMS control channel;
  • the indication information of the radio frame and/or subframe carrying the MBMS control channel further includes: an MBSFN radio frame period and an MBSFN radio frame offset.
  • the eNB transmits the radio frame and/or the subframe carrying the MBMS control channel to the terminal through the high layer signaling, which may be an MBSFN radio frame or a subframe resource, or may be a unicast frame or a subframe resource.
  • the high layer signaling which may be an MBSFN radio frame or a subframe resource, or may be a unicast frame or a subframe resource.
  • the sending of the indication information specifically includes two cases:
  • the MBMS control channel of one MBSFN area is carried on the MCH, that is, the actual MBSFN resource.
  • the radio frame used to carry the MBMS control channel needs to satisfy the following conversion relationship:
  • radioFrameAllocationPeriod radioFrameAllocationOffset
  • SFN represents the system frame number
  • the value is 0 or a positive integer.
  • SFN can take an integer from 0 to 1023
  • radioFrameAllocationPeriod represents MBSFN wireless.
  • radioFrameAllocationOffset indicates the MBSFN radio frame offset, which is an integer greater than or equal to 0, and is smaller than the value of radioFrameAllocationPeriod
  • PmcchPeriod indicates the period information of the radio frame and/or subframe that carries the MBMS control channel, and the value is An integer greater than or equal to radioFrameAllocationPeriod
  • mod represents the modulo operation.
  • the terminal obtains the radio frame carrying the MBMS control channel according to the indication information, that is, the radio frame corresponding to the SFN that satisfies the above conversion relationship.
  • the period PmcchPeriod of the radio frame and/or subframe carrying the MBMS control channel is the repetition period of the control signaling carried on the radio frame and/or subframe of the MBMS control channel; the radio carrying the MBMS control channel
  • the transmission offset PmcchOffset of the frame and/or subframe is the transmission offset of the control signaling carried on the radio frame and/or subframe of the MBMS control channel.
  • the eNB can inform the terminal of the period in which the radio frame and/or the subframe of the MBMS control channel is present through the PmcchPeriod, and the repetition period of the control signaling carried on the radio frame and/or the subframe of the MBMS control channel; by PmcchOffset
  • the transmission offset of the radio frame and/or subframe carrying the MBMS control channel and the transmission offset of the control signaling carried on the radio frame and/or subframe of the MBMS control channel may be informed.
  • PmcchPeriod can be used to describe The repetition period of the control signaling carried on the radio frames and/or subframes of the MBMS control channel, or may also be used to describe the modification period of the control signaling carried over the radio frames and/or subframes of the MBMS control channel.
  • the PmcchPeriod parameter can only represent one of the above meanings, as follows:
  • the modification period can be indirectly notified by a repeating period.
  • the indirect notification can use a multiple relationship, which can be fixed by the protocol, configured, and notified to the terminal.
  • the agreed modification period is 4 times of the repetition period, and the start position of the repetition period and the start position of the modification period may be kept aligned or not.
  • the start position of the modification period is not required to be notified; It is necessary to notify the start position of the modification period when it is not aligned.
  • the transmission offset indicated by PmcchOffset at this time is both the transmission offset of the modification period and the transmission offset of the repetition period.
  • the repetition period can be indirectly notified by the modification period.
  • the indirect notification can use a multiple relationship, which can be fixed by the protocol, configured, and notified to the terminal.
  • the agreed repetition period is 0.25 times the ⁇ ⁇ tampering period, and the start of the repeat period and the start position of the modification period may or may not be aligned.
  • Start position need to notify the start position of the modification period when it is not aligned.
  • the transmission offset represented by PmcchOffset at this time is both the transmission offset of the modification period and the transmission offset of the repetition period.
  • the PmcchPeriod in the indication information can simultaneously inform the terminal of the period information of the occurrence of the radio frame and/or the subframe carrying the MBMS control channel, and the repetition period of the control signaling carried on the radio frame and/or the subframe of the MBMS control channel.
  • Information and modification period information; PmcchOffset in the indication information may simultaneously inform the terminal of the transmission offset information of the radio frame and/or subframe carrying the MBMS control channel and the control signal carried on the radio frame and/or subframe of the MBMS control channel Send offset information.
  • the network side may implicitly notify the terminal of the PmcchPeriod by the radioFrameAllocationPeriod according to the multiple relationship between the preset PmcchPeriod and the radioFrameAllocationPeriod, so that the notification of the PmcchPeriod may be omitted, and the multiple relationship may be notified instead.
  • Choose the agreed multiple relationship so that you don't have to notice the multiple relationship.
  • the network side can implicitly notify the terminal of the PmcchOffset through the radioFrameAllocationOffset according to the multiple relationship between the preset PmcchOffset and the radioFrameAllocationOffset, so that the notification of the PmcchOffset can be omitted.
  • the notification of the PmcchOffset can be omitted.
  • the subframe information of the MBMS control channel carrying the MBMS control channel in the radio frame carrying the MBMS control channel may be indicated to the terminal by means of a bitmap, or a manner indicating a subframe number, or a fixed subframe.
  • the radio frame carrying the MBMS control channel may be a non-MBSFN radio frame, and the radio frame used to carry the MBMS control channel only needs to satisfy the following conversion relationship:
  • the SFN indicates the system frame number, and the value is 0 or a positive integer. However, since the largest system frame number in LTE is specified as 1023, the SFN can take an integer from 0 to 1023.
  • PmcchPeriod represents the radio frame carrying the MBMS control channel and/or Or the period information of the subframe;
  • the terminal obtains the radio frame carrying the MBMS control channel according to the indication information, that is, the radio frame corresponding to the SFN that satisfies the above conversion relationship.
  • the period PmcchPeriod of the radio frame and/or subframe carrying the MBMS control channel is the control signaling carried on the radio frame and/or subframe of the MBMS control channel.
  • the repetition period of the radio frame and/or subframe carrying the MBMS control channel, PmcchOffset is the transmission offset of the control signaling carried on the radio frame and/or subframe of the MBMS control channel.
  • the eNB can inform the terminal of the period in which the radio frame and/or the subframe of the MBMS control channel occurs by using the PmcchPeriod, and the repetition period of the control signaling carried on the radio frame and/or the subframe of the MBMS control channel; by PmcchOffset
  • the transmission offset of the radio frame and/or subframe carrying the MBMS control channel and the transmission offset of the control signaling carried on the radio frame and/or subframe of the MBMS control channel may be informed.
  • PmcchPeriod can be used to describe the repetition period of the control signaling carried on the radio frame and/or the subframe of the MBMS control channel, or can also be used to describe the bearer in the MBMS control channel.
  • the PmcchPeriod parameter can only represent one of the above meanings, as follows:
  • the modification period can be indirectly notified by a repeating period.
  • the indirect notification can use a multiple relationship, which can be fixed by the protocol, configured, and notified to the terminal.
  • the agreed modification period is 4 times of the repetition period, and the start position of the repetition period and the start position of the modification period may be kept aligned or not.
  • the start position of the modification period is not required to be notified; It is necessary to notify the start position of the modification period when it is not aligned.
  • the transmission offset indicated by PmcchOffset at this time is both the transmission offset of the modification period and the transmission offset of the repetition period.
  • the repetition period can be indirectly notified by the tampering period.
  • the indirect notification can use a multiple relationship, which can be fixed by the protocol, or configured, and notified to the terminal.
  • the agreed repetition period is 0.25 times the ⁇ ⁇ tampering period, and the start of the repeat period and the start position of the modification period may or may not be aligned.
  • Start position need to notify the start position of the modification period when it is not aligned.
  • the transmission offset represented by PmcchOffset at this time is both the transmission of the modification period. Offset, which is also the transmit offset of the repeat period.
  • the PmcchPeriod in the indication information can simultaneously inform the terminal of the period information of the occurrence of the radio frame and/or the subframe carrying the MBMS control channel, and the repetition period of the control signaling carried on the radio frame and/or the subframe of the MBMS control channel.
  • Information and modification period information; PmcchOffset in the indication information may simultaneously inform the terminal of the transmission offset information of the radio frame and/or subframe carrying the MBMS control channel and the control signal carried on the radio frame and/or subframe of the MBMS control channel Send offset information.
  • the subframe information of the MBMS control channel carrying the MBMS control channel in the radio frame carrying the MBMS control channel may be indicated to the terminal by means of a bitmap, or a manner indicating a subframe number, or a fixed subframe.
  • the above high layer signaling may be a system broadcast message, or a radio resource control RRC (Radio Resource Control) message, or dedicated signaling.
  • RRC Radio Resource Control
  • Step 202 The terminal parses the radio frame and/or the subframe that carries the MBMS control channel according to the obtained indication information of the radio frame and/or the subframe, and reads the MBMS control signaling from the radio frame and/or the subframe.
  • the terminal receives and parses the indication information according to the agreement with the sender, and then receives the radio frame and/or subframe that carries the MBMS control channel according to the indication information.
  • control signaling 7 is carried on the MCH
  • H does not have a radio frame for 10 ms, and each radio frame contains 10 subframes, and one subframe has a duration of 1 ms.
  • the network side configures a corresponding radio frame carrying the MBMS for the MBMS service in the MBSFN area according to the information such as the MBMS service volume in the MBSFN area.
  • the MBMS radio frame carried by a certain MBSFN area satisfies:
  • SIB System Information Block
  • the offset information is 40ms (4 radio frames).
  • the eNB may further indicate, to the terminal, subframe information that carries the MBMS control channel, and the terminal reads the MBMS control signaling from the corresponding subframe in the radio frame that carries the MBMS control channel.
  • the MBMS control signaling can be in any subframe within the MBSFN radio frame, but there are some agreed conditions in the actual application, for example, the agreed condition is: When the MBMS control channel is agreed to be carried only in the system configured MBSFN wireless In-frame for carrying When the MBMS service is on a subframe, then the MBMS control channel can only be carried on the MBMS subframe that the system has allocated.
  • the agreed condition is: When the MBMS control channel is agreed to be carried only in the system configured MBSFN wireless In-frame for carrying When the MBMS service is on a subframe, then the MBMS control channel can only be carried on the MBMS subframe that the system has allocated.
  • a control information including a Radio Network Temporary Identifier (RNTI) for identifying an MBMS control channel is carried in a control domain of the subframe, and the MBMS control signaling is carried.
  • the control information of the MBMS control channel further indicates information such as the specific location of the MBMS control channel in the data domain.
  • the terminal detects the control information of the RNTI for identifying the MBMS control channel by detecting the control domain information of the subframe in the radio frame that carries the MBMS control channel, and then parses the control information of the MBMS control channel, and further determines the MBMS control according to the control information.
  • the specific location of the channel where it receives MBMS control signaling and resolves MBMS control signaling.
  • the eNB indicates the subframe information carrying the MBMS control channel to the terminal in a manner of a bitmap, a manner indicating a subframe number, or a fixed subframe.
  • bitmap method such as: 1 Obit is used to describe the subframe used to carry the MBMS control channel in the radio frame specified in FIG. 3, and assumed to be carried on subframe #1 and subframe #2 shown in FIG.
  • the signaling of the bitmap is "0110000000", and each bit in the signaling corresponds to each subframe from #0 to #9, and the corresponding bit is set to "1", indicating that the subframe carries the MBMS control channel.
  • the method of indicating the subframe number that is, considering that each radio frame includes 10 subframes, 4 bits are required to distinguish that each subframe carries an MBMS control channel, for example: "0001" indicates that the subframe #1 carries the MBMS control channel, " 0010” indicates that the MBMS control channel is carried on subframe #2.
  • the command is "0001, 0010" to inform the terminal.
  • the so-called fixed subframe mode that is, in the radio frame that has been indicated to carry the MCCH, the MCCH is fixedly carried by one or more subframes, which is the default for both the eNB and the terminal. For example: carried by fixed subframe #1, then on subframe #1 within the radio frame indicated to carry the MCCH Host the MCCH. This eliminates the signaling overhead of indicating the location of the subframe.
  • the configurations of PmcchPeriod and PmcchOffset are relatively flexible, which provides flexibility for the eNB to send MBMS control channels, and can flexibly select radio frames to facilitate scheduling by the eNB.
  • the problem of signaling overhead needs to be considered, which imposes certain restrictions on the radio frame selection of the MBMS control channel.
  • PmcchOffset in the embodiment of the present invention, generally, any positive integer smaller than PmcchPeriod can be taken.
  • the values of the PmcchOffset and the radioFrameAllocationOffset may be agreed to be the same, so that the value of the PmcchOffset is not notified to the terminal, and the terminal according to the agreement According to the value of radioFrameAllocationOffset, the value of PmcchOffset can be directly known.
  • the signaling overhead can be reduced, and only the PmcchPeriod is notified to the terminal in the system broadcast message, and the PmcchOffset implicitly notifies the notification through the radioFrameAllocationOffset.
  • PmcchPeriod can also specify a fixed value through the protocol, which can also reduce the signaling overhead.
  • PmcchPeriod can also establish a correspondence with radioFrameAllocationPeriod, implicit notification via radioFrameAllocationPeriod.
  • PmcchPeriod and radioFrameAllocationPeriod are in multiples (PmcchPeriod is 4 times that of radioFrameAllocationPeriod), so that only radioFrameAllocationPeriod and multiples relationship "4" are required, and the terminal can know the value of PmcchPeriod indirectly through radioFrameAllocationPeriod.
  • the MBMS control signaling may be set to be updated in each PmcchPeriod, or may be updated after several consecutive PmcchPeriods are set.
  • the MBMS control signaling is set to a fixed period, preferably 320 ms, 640 ms, 160 ms, and the like. If the MBMS control signaling is set to send the same content in consecutive repeating cycles, the update is not allowed, Several consecutive repetition periods are defined as one modification period, and updates can only occur when the modification period arrives.
  • the repetition period of MBMS control signaling is 320ms, and the period of ⁇ ' tampering is 1280ms, so that MBMS control signaling is not allowed to be updated in four consecutive repetition periods. Since the repetition period information of the MBMS control signaling is carried on the system broadcast message, it is preferable to set the repetition period and the modification period of the control signaling on the radio frame and/or the subframe that carries the MBMS control channel and the system broadcast respectively. The repetition period of the message and the modification period are consistent; or the modification period of the control signaling on the radio frame and/or the subframe that carries the MBMS control channel is consistent with the modification period of the system broadcast message.
  • the information on the system broadcast message is used to indicate the repetition period or the modification period of the bearer MBMS control channel. Change in time.
  • the embodiment in which the control signaling is carried on the DL-SCH is substantially similar to the embodiment in which the control signaling is carried on the MCH, and details are not described herein again. The difference is that the control signaling is carried on the DL-SCH.
  • the present invention also provides a transmission system for MBMS control signaling.
  • the system is composed of a connected network side 10 and a terminal 20.
  • the network side 10 is configured to send, by using the high layer signaling, the indication information of the radio frame and/or the subframe that carries the MBMS control channel to the terminal 20, and send the MBMS to the terminal 20 by using the radio frame and/or the subframe that carries the MBMS control channel. Control signaling.
  • the terminal 20 is configured to parse a radio frame and/or a subframe that carries an MBMS control channel according to the obtained indication information of the radio frame and/or the subframe, and read the MBMS control signaling from the radio frame and/or the subframe.
  • the MBMS control channel referred to in the present invention may be: MCCH, or P-MCCH, or S-MCCH, or MICH, or MTCH.
  • the indication information of the radio frame and/or the subframe that carries the MBMS control channel includes at least one of the following: including the period information and the transmission offset information of the radio frame and/or the subframe that carries the MBMS control channel; including the bearer in the MBMS control. Transmission offset information of control signaling on radio frames and/or subframes of the channel; further comprising repetition period information and modification period information of control signaling carried on radio frames and/or subframes of the MBMS control channel;
  • the indication information of the radio frame and/or subframe carrying the MBMS control channel further includes: an MBSFN radio frame period and an MBSFN radio frame offset.
  • the present invention eliminates the randomness of sending MBMS control signaling on the system side and receiving MBMS control signaling by the terminal, reduces signaling overhead of the terminal, and facilitates power saving of the terminal.
  • the indication information of the radio frame and/or the subframe of the MBMS control channel can be flexibly configured, which provides flexibility for the network side to transmit the MBMS control signaling.
  • the subframes carrying the MBMS control channel can be flexibly selected in the present invention, which facilitates the scheduling on the network side. .

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Abstract

本发明公开了一种多媒体广播多播业务(MBMS)控制信令的传输方法,包括: 网络侧通过高层信令将承载 MBMS控制信道的无线帧和/或子帧的指示信息发送给终端,并通过承载 MBMS控制信道的无线帧和/或子帧向终端发送MBMS控制信令;终端根据获取的无线帧和/或子帧的指示信息,解析出承载 MBMS控制信道的无线帧和/或子帧,并从无线帧和/或子帧中读取MBMS控制信令。本发明还公开了一种 MBMS控制信令的传输系统,解决了系统侧配置MBMS控制信道的问题,为MBMS控制信令传输提供了方法,以较小的信令开销消除了系统侧发送MBMS控制信令和终端接收MBMS控制信令的随机性。

Description

多媒体广播多播业务控制信令的传输方法和系统 技术领域
本发明涉及长期演进(LTE )系统中的广播传输技术, 尤其涉及一种多 媒体广播多播业务(MBMS )控制信令的传输方法和系统。 背景技术
随着互联网的迅猛发展, 出现了大量移动数据多媒体业务和各种高带 宽多媒体业务, 例如: 视频会议、 电视广播、 视频点播、 广告、 网上教育、 互动游戏等, 这满足了移动用户不断上升的业务需求, 也为移动运营商带 来新的业务增长点。 这些移动数据多媒体业务要求多个用户能够同时接收 相同数据, 与普通的数据业务相比, 具有数据量大、 持续时间长、 时延敏 感等特点。
为了有效利用移动网络资源, 第三代合作伙伴计划 (3GPP , 3rd Generation Partnership Project ) 提出了多媒体广播多播业务 (MBMS , Multimedia Broadcast Multicast Service )。该业务是一种从一个数据源向多个 目标传送数据的技术, 实现了网络(包括核心网和接入网) 资源的共享, 提高了网络资源, 尤其是空中接口资源的利用率。 3GPP定义的 MBMS不 仅能够实现纯文本低速率的消息类组播和广播, 而且还能够实现高速多媒 体业务的组播和广播, 提供多种丰富的视频、 音频等多媒体业务。
在长期演进( LTE , Long Term Evolution ) 系统中, MBMS业务可以釆 用混合载波的方式发送。 混合载波是指单播业务(Unicast ) 和多播业务 ( MBMS ) 以时分复用的方式在同一载波上发送, 时分复用的最小单位为 子帧。 目前 LTE中用来承载 MBMS业务的无线帧满足下述关系:
SFN mod radioFrameAllocationPeriod = radioFrameAllocationOffset 其中, 由于 LTE中最大的系统帧号 (即系统为无线帧的编号)规定为 1023 , 所以系统帧号 (SFN, System Frame Number )从 0到 1023编号; radioFrameAllocationPeriod 表示多媒体广播多播业务单频网 ( MBSFN , MBMS single Frequency Network )无线帧周期, 其取值可以为 { 1 , 2, 4, 8, 16, 32}中任意一个; radioFrameAllocationOffset表示 MBSFN无线帧的偏 移,其取值为大于或等于 0的整数,且小于选定的 MBSFN无线帧周期的数 值; mod表示 SFN对 radioFrameAllocationPeriod的取模运算。上述的 MBMS 业务的无线帧满足的关系式的信息在系统消息的 SIB2 ( System Information Block Type 2 )上发送给终端。 根据上述关系, radioFrameAllocationPeriod 取值为 2, radioFrameAllocationOffset=0 , 得到的 MBSFN无线帧如图 1所 示, 图中的阴影部分即表示系统配置的 MBSFN无线帧。 MBSFN无线帧是 用来承载 MBMS业务的无线帧。 进一步, 系统会在 MBSFN无线帧上配置 那些子帧为 7 载 MBMS 业务的子帧, 称为 MBSFN子帧。 MBSFN 帧和 MBSFN子帧都称为 MBSFN资源;这些 MBSFN资源构成多播信道( MCH, Multicast Channel )传输信道。
在目前的 LTE已公开技术中规定, 釆用分层结构时, MBMS的多播控 制信道 MCCH ( Multicast Control Channel )分为两种, 一种是主多播控制信 道(P-MCCH, Primary MCCH ), 用于承载主多播控制信令; 另一种是次多 播控制信道( S-MCCH, Secondary MCCH ), 用于承载次多播控制信令。 在 不釆用分层结构时, MBMS 的控制信道即称为 MCCH, 用来承载 MBMS 的控制信令。 LTE 已公开技术中还规定系统广播消息 (BCCH, Broadcast Control Channel )上可以指示一个或者两个 P-MCCH的调度信息, 一个为 单小区模式被传输在下行共享信道(DL-SCH, Downlink Shared Channel ) 上, 一个为多小区模式被传输在 MCH上。 P-MCCH中承载与 MBSFN区域 业务相关的控制信令, 该信令用来说明该区域内有哪些有效的 MBMS等信 息。 如果有必要, P-MCCH中还可以承载 S-MCCH的指示信息, 以帮助发 现 S-MCCH。
根据 LTE 已公开技术的描述, MBMS业务分为单小区模式和多小区模 式, P-MCCH也分为单小区模式和多小区模式。 单小区模式的一个主要特 点是不支持多小区 MBSFN合并,多小区模式是必须支持多小区 MBSFN合 并的。 而根据最新的 LTE 已公开技术描述, MCCH可能不再支持 MBSFN 合并, 且不考虑主次结构。
由此可以看出, 多小区模式发送的 P-MCCH是必须承载在多播帧构成 的多播资源上, S-MCCH也是进行多小区模式发送的, 也要承载在多播帧 构成的多播资源上。 如果 MCCH不再分为主次结构, 不再进行多小区模式 发送, 那么 MCCH本身可以承载在单播资源上, 即 DL-SCH上, 也可以承 载在多播帧构成的多播资源上, 即 MCH上。
无论是针对上述何种情况, 由于现有技术没有赋予 P-MCCH、 S-MCCH 或者 MCCH统一的发送规范, 从而会造成系统侧的发送非常随机。 也就是 说, 需要终端非常频繁地尝试接收上述 MBMS控制信道(包括: P-MCCH、 S-MCCH, MCCH ), 这样对于终端的接收也会带来随机性, 造成较大的信 令开销, 也不便于终端的省电。 发明内容
有鉴于此, 本发明的主要目的在于提供一种 MBMS控制信令的传输方 法和系统, 以消除系统侧发送 MBMS控制信令和终端接收 MBMS控制信 令的随机性, 降低终端的信令开销。
为达到上述目的, 本发明的技术方案是这样实现的:
本发明提供了一种 MBMS控制信令的传输方法, 该方法包括: 网络侧通过高层信令将承载 MBMS控制信道的无线帧和 /或子帧的指 示信息发送给终端,并通过所述承载 MBMS控制信道的无线帧和 /或子帧向 所述终端发送 MBMS控制信令;
所述终端根据获取的无线帧和 /或子帧的指示信息, 解析出承载所述 MBMS 控制信道的无线帧和 /或子帧, 并从所述无线帧和 /或子帧中读取 MBMS控制信令。
所述 MBMS控制信道为: 多播控制信道(MCCH )、 或者主多播控制 信道(P-MCCH )、 或者次多播控制信道(S-MCCH )、 或者多播指示信道 ( MICH )或者多播传输信道( MTCH )。
所述承载 MBMS控制信道的无线帧和 /或子帧的指示信息至少包括下 述之一:
包括承载 MBMS控制信道的无线帧和 /或子帧出现的周期信息和发送 偏移信息;
包括承载在 MBMS 控制信道的无线帧和 /或子帧上的控制信令的发送 偏移信息;
还包括承载在 MBMS 控制信道的无线帧和 /或子帧上的控制信令的重 复周期信息和修改周期信息;
所述承载 MBMS 控制信道的无线帧和 /或子帧的指示信息还包括: MBSFN无线帧周期和 MBSFN无线帧偏移。
所述根据无线帧的指示信息解析出承载 MBMS控制信道的无线帧, 具 体为:
根据换算关系 SFN mod PmcchPeriod=PmcchOffset和
SFN mod radioFrameAllocationPeriod=radioFrameAllocationOffset解析 出承载 MBMS控制信道的无线帧; 其中, SFN表示系统帧号, 取值为正整 数 ; radioFrameAllocationPeriod 表 示 MBSFN 无 线 帧 周 期 ; radioFrameAllocationOffset表示 MBSFN无线帧偏移, 取值为大于或等于 0 的整数, 且小于 radioFrameAllocationPeriod的取值; PmcchPeriod表示承载 MBMS 控制信道的无线帧和 /或子帧出现的周期信息, 取值为大于或等于 radioFrameAllocationPeriod的整数; PmcchOffset表示 载 MBMS控制信道 的无线帧和 /或子帧出现的发送偏移信息, 相对于 SFN=0的无线帧的偏移, 取值为 0或小于 PmcchPeriod的正整数; mod表示取模运算;所述承载 MBMS 控制信道的无线帧即为满足换算关系 SFN mod PmcchPeriod=PmcchOffset , 或者同时满足上述两个换算关系的 SFN所对应的无线帧。
该方法进一步包括至少下述步骤之一:
网络侧根据预设的所述发送偏移与 MBSFN无线帧偏移的对应关系,通 过 MBSFN无线帧偏移将所述发送偏移隐含通知给所述终端;
网络侧根据预设的所述重复周期与 MBSFN无线帧周期的对应关系,通 过 MBSFN无线帧周期将所述重复周期隐含通知给所述终端;
网络侧根据预设的所述重复周期与所述修改周期的对应关系, 通过重 复周期将所述修改周期隐含通知给所述终端;
网络侧根据预设的所述重复周期与所述修改周期的对应关系, 通过修 改周期将所述重复周期隐含通知给所述终端。
所述网络侧通过高层信令向终端发送承载 MBMS控制信道的无线帧和 /或子帧的指示信息为:
所述网络侧在通过高层信令通知承载 MBMS控制信道的无线帧信息的 基础上, 进一步在高层信令通过位图 (bitmap )的方式、 或通过高层信令指 示子帧号的方式、 或固定子帧的方式向终端指明承载 MBMS控制信道的无 线帧内具体承载 MBMS控制信道的子帧信息。
所述高层信令为系统广播消息, 或者无线资源控制 (RRC ) 消息, 或 者专用信令。
本发明还提供了一种 MBMS控制信令的传输方法, 该方法包括: 网络侧通过高层信令将承载 MBMS控制信道的无线帧和 /或子帧的指 示信息发送给终端,并通过所述承载 MBMS控制信道的无线帧和 /或子帧向 所述终端发送 MBMS控制信令。
所述 MBMS控制信道为: MCCH、 或者 P-MCCH、 或者 S-MCCH、 或 者 MICH、 或者 MTCH。
所述承载 MBMS控制信道的无线帧和 /或子帧的指示信息至少包括下 述之一:
包括承载 MBMS控制信道的无线帧和 /或子帧出现的周期信息和发送 偏移信息;
包括承载在 MBMS 控制信道的无线帧和 /或子帧上的控制信令的发送 偏移信息;
还包括承载在 MBMS 控制信道的无线帧和 /或子帧上的控制信令的重 复周期信息和修改周期信息;
所述承载 MBMS 控制信道的无线帧和 /或子帧的指示信息还包括: MBSFN无线帧周期和 MBSFN无线帧偏移。
该方法进一步包括至少下述步骤之一:
网络侧根据预设的所述发送偏移与 MBSFN无线帧偏移的对应关系,通 过 MBSFN无线帧偏移将所述发送偏移隐含通知给所述终端;
网络侧根据预设的所述重复周期与 MBSFN无线帧周期的对应关系,通 过 MBSFN无线帧周期将所述重复周期隐含通知给所述终端;
网络侧根据预设的所述重复周期与所述修改周期的对应关系, 通过重 复周期将所述修改周期隐含通知给所述终端;
网络侧根据预设的所述重复周期与所述修改周期的对应关系, 通过修 改周期将所述重复周期隐含通知给所述终端。
所述网络侧通过高层信令向终端发送承载 MBMS控制信道的无线帧和 /或子帧的指示信息的一种情况为: 所述网络侧在通过高层信令通知承载 MBMS控制信道的无线帧信息的 基础上, 进一步在高层信令通过 bitmap的方式、 或指示子帧号的方式、 或 固定子帧的方式向终端指明承载 MBMS 控制信道的无线帧内具体承载 MBMS控制信道的子帧信息。
所述高层信令为系统广播消息, 或者 RRC消息, 或者专用信令。 本发明还提供了一种 MBMS控制信令的传输方法, 该方法包括: 终端通过高层信令获取来自网络侧的承载 MBMS控制信道的无线帧和 /或子帧的指示信息;
所述终端根据获取的无线帧和 /或子帧的指示信息, 解析出承载所述 MBMS 控制信道的无线帧和 /或子帧, 并从所述无线帧和 /或子帧中读取 MBMS控制信令。
所述 MBMS控制信道为: MCCH、 或者 P-MCCH、 或者 S-MCCH、 或 者 MICH、 或者 MTCH。
所述承载 MBMS控制信道的无线帧和 /或子帧的指示信息至少包括下 述之一:
包括承载 MBMS控制信道的无线帧和 /或子帧出现的周期信息和发送 偏移信息;
包括承载在 MBMS 控制信道的无线帧和 /或子帧上的控制信令的发送 偏移信息;
还包括承载在 MBMS 控制信道的无线帧和 /或子帧上的控制信令的重 复周期信息和修改周期信息;
所述承载 MBMS 控制信道的无线帧和 /或子帧的指示信息还包括: MBSFN无线帧周期和 MBSFN无线帧偏移。
所述根据无线帧的指示信息解析出承载 MBMS控制信道的无线帧, 具 体为: 根据换算关系 SFN mod PmcchPeriod=PmcchOffset和
SFN mod radioFrameAllocationPeriod=radioFrameAllocationOffset解析 出承载 MBMS控制信道的无线帧; 其中, SFN表示系统帧号, 取值为正整 数 ; radioFrameAllocationPeriod 表 示 MBSFN 无 线 帧 周 期 ; radioFrameAllocationOffset表示 MBSFN无线帧偏移, 取值为大于或等于 0 的整数 , 且小于 radioFrameAllocationPeriod的取值; PmcchPeriod表示承载 MBMS 控制信道的无线帧和 /或子帧出现的周期信息, 取值为大于或等于 radioFrameAllocationPeriod的整数; PmcchOffset表示 载 MBMS控制信道 的无线帧和 /或子帧出现的发送偏移信息, 相对于 SFN=0的无线帧的偏移, 取值为 0或小于 PmcchPeriod的正整数; mod表示取模运算;所述承载 MBMS 控制信道的无线帧即为满足换算关系 SFN mod PmcchPeriod=PmcchOffset , 或者同时满足上述两个换算关系的 SFN所对应的无线帧。
所述高层信令为系统广播消息, 或者 RRC消息, 或者专用信令。
本发明还提供了一种 MBMS控制信令的传输系统, 该系统包括相连的 网络侧和终端, 其中,
所述网络侧, 用于通过高层信令将承载 MBMS 控制信道的无线帧和 / 或子帧的指示信息发送给终端, 并通过所述承载 MBMS控制信道的无线帧 和 /或子帧向所述终端发送 MBMS控制信令;
所述终端, 用于根据获取的无线帧和 /或子帧的指示信息, 解析出承载 所述 MBMS控制信道的无线帧和 /或子帧, 并从所述无线帧和 /或子帧中读 取 MBMS控制信令。
所述 MBMS控制信道为: MCCH、 或者 P-MCCH、 或者 S-MCCH、 或 者 MICH、 或者 MTCH。
所述承载 MBMS控制信道的无线帧和 /或子帧的指示信息至少包括下 述之一: 包括承载 MBMS控制信道的无线帧和 /或子帧出现的周期信息和发送 偏移信息;
包括承载在 MBMS 控制信道的无线帧和 /或子帧上的控制信令的发送 偏移信息;
还包括承载在 MBMS 控制信道的无线帧和 /或子帧上的控制信令的重 复周期信息和修改周期信息;
所述承载 MBMS 控制信道的无线帧和 /或子帧的指示信息还包括: MBSFN无线帧周期和 MBSFN无线帧偏移。
本发明所提供的 MBMS控制信令的传输方法和系统, 由网络侧通过高 层信令向终端发送承载 MBMS控制信道的无线帧和 /或子帧的指示信息;终 端根据获取的无线帧和 /或子帧的指示信息,解析出承载 MBMS控制信道的 无线帧和 /或子帧, 并从无线帧和 /或子帧中读取 MBMS控制信令。 本发明 解决了系统侧配置 MBMS控制信道的问题, 为 MBMS控制信令传输提供 了方法, 以较小的信令开销消除了系统侧发送 MBMS控制信令和终端接收 MBMS控制信令的随机性, 便于终端的省电; 此外, 本发明中承载 MBMS 控制信道的无线帧和 /或子帧的指示信息可以灵活配置, 为网络侧发送 MBMS控制信令提供了灵活性;本发明中承载 MBMS控制信道的子帧可以 灵活选择, 便于网络侧的调度。 附图说明
图 1为现有技术中 MBSFN无线帧的配置示意图;
图 2为本发明一种 MBMS控制信令的传输方法的流程图;
图 3为本发明实施例中用以承载 MBMS的无线帧示意图;
图 4为本发明实施例中承载 MBMS控制信道的无线帧示意图一; 图 5为本发明实施例中承载 MBMS控制信道的无线帧示意图二; 图 6为本发明实施例中承载 MBMS控制信道的无线帧示意图三; 图 7为本发明实施例中承载 MBMS控制信道的无线帧示意图四; 图 8为本发明实施例中承载 MBM S控制信道的无线帧示意图五; 图 9为本发明实施例中承载 MBMS控制信道的子帧结构示意图; 图 10为本发明一种 MBMS控制信令的传输系统的组成结构示意图。 具体实施方式
下面结合附图和具体实施例对本发明的技术方案进一步详细阐述。 本发明所提供的一种 MBMS控制信令的传输方法, 如图 2所示, 主要 包括以下步骤:
步骤 201 , 网络侧通过高层信令将承载 MBMS控制信道的无线帧和 /或 子帧的指示信息发送给终端,并通过承载 MBMS控制信道的无线帧和 /或子 帧向终端发送 MBMS控制信令。
本发明的网络侧可以是基站( eNB ),或者移动管理实体( MME, Mobility Management Entity ),或者网关( Get-way ),或者演进分组系统( EPS , Evolved Packet System ),或者多点协作实体 ( MCE, Multi-cell/Multicast Coordination Entity )等。 下面以基站 eNB为例进行描述。
本发明所指的 MBMS 控制信道既可以是 LTE 已公开技术中描述的 P-MCCH和 S-MCCH,也可以是 LTE 已公开技术中描述的 MCCH,也可以 是多播指示信道( MICH , Multicast Indicator Channel ), 还可以是其他的信 道, 例如: 多播传输信道(MTCH, Multicast Traffic Channel )等等。 当然, 本发明中的 MBMS控制信道并不仅限于上述所举, 还可以根据实际需要进 行扩展。
本发明中, eNB通过高层信令向终端发送的承载 MBMS控制信道的无 线帧和 /或子帧的指示信息具体为:可以只向终端指明承载 MBMS控制信道 的无线帧, 至于无线帧中那些子帧承载 MBMS控制信道, 则可以选择 eNB 与终端预先协商好的固定子帧, 或者终端盲检承载 MBMS控制信道的无线 帧的所有子帧,因此 eNB只需向终端发送承载 MBMS控制信道的无线帧的 指示信息; eNB也可以只向终端指明承载 MBMS控制信道的子帧, 至于承 载 MBMS控制信道的无线帧,则可以选择 eNB与终端预先协商好的固定无 线帧, 或者终端盲检每个无线帧上的固定子帧, 因此 eNB只需向终端发送 承载 MBMS控制信道的子帧的指示信息; eNB还可以同时向终端指明承载 MBMS控制信道的无线帧和子帧,从而需要向终端发送承载 MBMS控制信 道的无线帧和子帧的指示信息。
本发明中 eNB通知子帧的指示信息时可以釆用位图 (bitmap )的方式、 或指示子帧号的方式、 或固定子帧的方式向终端指明承载 MBMS控制信道 的无线帧内具体承载 MBMS控制信道的子帧信息。
另外,承载 MBMS控制信道的无线帧和 /或子帧的指示信息至少包括下 述之一:
包括承载 MBMS控制信道的无线帧和 /或子帧出现的周期信息和发送 偏移信息;包括承载在 MBMS控制信道的无线帧和 /或子帧上的控制信令的 发送偏移信息;还包括承载在 MBMS控制信道的无线帧和 /或子帧上的控制 信令的重复周期 (repetition period ) 信息和爹改周期信息 (modification period );
承载 MBMS控制信道的无线帧和 /或子帧的指示信息还包括: MBSFN 无线帧周期和 MBSFN无线帧偏移。
本发明中, eNB通过高层信令向终端发送承载 MBMS控制信道的无线 帧和 /或子帧可以是 MBSFN无线帧或者子帧资源, 也可以是单播的帧或者 子帧资源。
指示信息的发送具体包括两种情况:
1、 如果 MBMS 控制信令承载在多播帧构成的 MCH 上, 那么一个 MBSFN区域的 MBMS控制信道承载在 MCH上, 即实际 MBSFN资源上。 对于一个 MBSFN区域, 用来承载 MBMS控制信道的无线帧需要满足如下 换算关系:
SFN mod PmcchPeriod=PmcchOffset ,
和 SFN mod radioFrameAllocationPeriod=radioFrameAllocationOffset , 其中, SFN表示系统帧号, 取值为 0或正整数, 然而由于 LTE中最大 的系统帧号规定为 1023 , 因此 SFN 可以取 0 到 1023 的整数; radioFrameAllocationPeriod 表 示 MBSFN 无 线 帧 周 期 ; radioFrameAllocationOffset表示 MBSFN无线帧偏移, 取值为大于或等于 0 的整数 , 且小于 radioFrameAllocationPeriod的取值; PmcchPeriod表示承载 MBMS 控制信道的无线帧和 /或子帧出现的周期信息, 取值为大于或等于 radioFrameAllocationPeriod的整数; PmcchOffset表示 载 MBMS控制信道 的无线帧和 /或子帧出现的发送偏移信息, 相对于 SFN=0的无线帧的偏移, 取值为 0或小于 PmcchPeriod的正整数; mod表示取模运算。终端根据上述 指示信息得到承载 MBMS 控制信道的无线帧, 即为满足上述换算关系的 SFN所对应的无线帧。
需要指出的是, 承载 MBMS控制信道的无线帧和 /或子帧出现的周期 PmcchPeriod就是承载在 MBMS控制信道的无线帧和 /或子帧上的控制信令 的重复周期; 承载 MBMS 控制信道的无线帧和 /或子帧的发送偏移 PmcchOffset就是承载在 MBMS控制信道的无线帧和 /或子帧上的控制信令 的发送偏移。 因此, eNB通过 PmcchPeriod可以告知终端承载 MBMS控制 信道的无线帧和 /或子帧出现的周期,以及^载在 MBMS控制信道的无线帧 和 /或子帧上的控制信令的重复周期; 通过 PmcchOffset 可以告知终端承载 MBMS控制信道的无线帧和 /或子帧的发送偏移, 以及承载在 MBMS控制 信道的无线帧和 /或子帧上的控制信令的发送偏移。
另外, 本发明中 eNB发送的指示信息中 PmcchPeriod既可以用来描述 承载在 MBMS控制信道的无线帧和 /或子帧上的控制信令的重复周期,或者 也可以用来描述承载在 MBMS 控制信道的无线帧和 /或子帧上的控制信令 的修改周期。 实际应用时 PmcchPeriod参数只能代表上述其中一个含义,具 体如下 2种情况:
当 PmcchPeriod描述重复周期时, 可以通过重复周期间接通知修改周 期。 间接通知可以使用倍数关系, 该倍数关系可以通过协议固定, 也可以 通过配置, 并通知终端。 例如, 约定修改周期是重复周期的 4倍, 并且重 复周期的起始和修改周期的起始位置可以保持对齐, 也可以不对齐, 当保 持对齐时, 不需要通知修改周期的起始位置; 当不对齐时需要通知修改周 期的起始位置。此时的 PmcchOffset表示的发送偏移既是修改周期的发送偏 移, 也是重复周期的发送偏移。
当 PmcchPeriod描述修改周期时, 可以通过修改周期间接通知重复周 期。 间接通知可以使用倍数关系, 该倍数关系可以通过协议固定, 也可以 通过配置, 并通知终端。 例如, 约定重复周期是^ ί'爹改周期的 0.25倍, 并且 重复周期的起始和修改周期的起始位置可以保持对齐, 也可以不对齐, 当 保持对齐时, 不需要通知修改周期的起始位置; 当不对齐时需要通知修改 周期的起始位置。此时的 PmcchOffset表示的发送偏移既是修改周期的发送 偏移, 也是重复周期的发送偏移。
从而, 指示信息中的 PmcchPeriod可以同时告知终端承载 MBMS控制 信道的无线帧和 /或子帧的出现的周期信息、承载在 MBMS控制信道的无线 帧和 /或子帧上的控制信令的重复周期信息和修改周期信息; 指示信息中的 PmcchOffset可以同时告知终端承载 MBMS控制信道的无线帧和 /或子帧的 发送偏移信息和承载在 MBMS 控制信道的无线帧和 /或子帧上的控制信令 的发送偏移信息。
这里需要说明的是, PmcchPeriod和 radioFrameAllocationPeriod之间也 可以存在间接的倍数关系, 即网络侧可以根据预设的 PmcchPeriod 与 radioFrameAllocationPeriod的倍数关系 ,通过 radioFrameAllocationPeriod将 PmcchPeriod隐含通知给终端, 这样就可以省去 PmcchPeriod的通知, 可以 改为通知倍数关系, 也可以选择约定倍数关系, 这样就不用通知倍数关系 了。 PmcchOffset和 radioFrameAllocationOffset之间也可以存在间接的倍数 关系, 即网络侧可以根据预设的 PmcchOffset和 radioFrameAllocationOffset 的倍数关系, 通过 radioFrameAllocationOffset将 PmcchOffset隐含通知给终 端, 这样就可以省去 PmcchOffset的通知, 可以改为通知倍数关系, 也可以 选择约定倍数关系, 这样就不用通知倍数关系了。
这里 eNB通知子帧的指示信息时可以釆用 bitmap的方式、或指示子帧 号的方式、 或固定子帧的方式向终端指明承载 MBMS控制信道的无线帧内 具体承载 MBMS控制信道的子帧信息。
2、如果控制信令承载在单播资源上, 即 DL-SCH上, 那么承载 MBMS 控制信道的无线帧可以是非 MBSFN无线帧, 用来承载 MBMS控制信道的 无线帧只需满足如下换算关系:
SFN mod PmcchPeriod=PmcchOffset ,
其中, SFN表示系统帧号, 取值为 0或正整数, 然而由于 LTE中最大 的系统帧号规定为 1023 , 因此 SFN可以取 0到 1023的整数; PmcchPeriod 表示承载 MBMS控制信道的无线帧和 /或子帧出现的周期信息; PmcchOffset 表示承载 MBMS控制信道的无线帧和 /或子帧出现的发送偏移信息,相对于 SFN=0的无线帧的偏移, 取值为 0或小于 PmcchPeriod的正整数; mod表 示 SFN对 PmcchPeriod的取模运算。终端根据上述指示信息得到承载 MBMS 控制信道的无线帧, 即为满足上述换算关系的 SFN所对应的无线帧。
需要指出的是, 承载 MBMS控制信道的无线帧和 /或子帧出现的周期 PmcchPeriod就是承载在 MBMS控制信道的无线帧和 /或子帧上的控制信令 的重复周期; 承载 MBMS 控制信道的无线帧和 /或子帧的发送偏移 PmcchOffset就是承载在 MBMS控制信道的无线帧和 /或子帧上的控制信令 的发送偏移。 因此, eNB通过 PmcchPeriod可以告知终端 载 MBMS控制 信道的无线帧和 /或子帧出现的周期,以及^载在 MBMS控制信道的无线帧 和 /或子帧上的控制信令的重复周期; 通过 PmcchOffset 可以告知终端承载 MBMS控制信道的无线帧和 /或子帧的发送偏移, 以及承载在 MBMS控制 信道的无线帧和 /或子帧上的控制信令的发送偏移。
另外, 本发明中 eNB发送的指示信息中 PmcchPeriod既可以用来描述 承载在 MBMS控制信道的无线帧和 /或子帧上的控制信令的重复周期,或者 也可以用来描述承载在 MBMS 控制信道的无线帧和 /或子帧上的控制信令 的修改周期。 实际应用时 PmcchPeriod参数只能代表上述其中一个含义,具 体如下 2种情况:
当 PmcchPeriod描述重复周期时, 可以通过重复周期间接通知修改周 期。 间接通知可以使用倍数关系, 该倍数关系可以通过协议固定, 也可以 通过配置, 并通知终端。 例如, 约定修改周期是重复周期的 4倍, 并且重 复周期的起始和修改周期的起始位置可以保持对齐, 也可以不对齐, 当保 持对齐时, 不需要通知修改周期的起始位置; 当不对齐时需要通知修改周 期的起始位置。此时的 PmcchOffset表示的发送偏移既是修改周期的发送偏 移, 也是重复周期的发送偏移。
当 PmcchPeriod描述修改周期时, 可以通过爹改周期间接通知重复周 期。 间接通知可以使用倍数关系, 该倍数关系可以通过协议固定, 也可以 通过配置, 并通知终端。 例如, 约定重复周期是^ ί'爹改周期的 0.25倍, 并且 重复周期的起始和修改周期的起始位置可以保持对齐, 也可以不对齐, 当 保持对齐时, 不需要通知修改周期的起始位置; 当不对齐时需要通知修改 周期的起始位置。此时的 PmcchOffset表示的发送偏移既是修改周期的发送 偏移, 也是重复周期的发送偏移。
从而 , 指示信息中的 PmcchPeriod可以同时告知终端承载 MBMS控制 信道的无线帧和 /或子帧的出现的周期信息、承载在 MBMS控制信道的无线 帧和 /或子帧上的控制信令的重复周期信息和修改周期信息; 指示信息中的 PmcchOffset可以同时告知终端承载 MBMS控制信道的无线帧和 /或子帧的 发送偏移信息和承载在 MBMS 控制信道的无线帧和 /或子帧上的控制信令 的发送偏移信息。
这里 eNB通知子帧的指示信息时可以釆用 bitmap的方式、或指示子帧 号的方式、 或固定子帧的方式向终端指明承载 MBMS控制信道的无线帧内 具体承载 MBMS控制信道的子帧信息。
上述的高层信令可以为系统广播消息, 或者无线资源控制 RRC ( Radio Resource Control ) 消息, 或者专用信令。
步骤 202 , 终端根据获取的无线帧和 /或子帧的指示信息, 解析出承载 MBMS控制信道的无线帧和 /或子帧, 并从无线帧和 /或子帧中读取 MBMS 控制信令。
终端根据和发送端的约定, 接收并解析指示信息, 然后依据指示信息 接收承载 MBMS控制信道的无线帧和 /或子帧。
关于子帧信息的相关操作将在后续的具体实施例中进行详细阐述。 下面结合具体实施例, 对上述 MBMS控制信令的传输方法进行详细阐 述。 以控制信令 7 载在 MCH上为例, H没一个无线帧的时长为 10ms, — 个无线帧内包含 10个子帧, 一个子帧时长为 lms。 对于一个 MBSFN区域 而言, 网络侧会根据该 MBSFN区域内的 MBMS业务量等信息, 为该区域 配置相应的承载 MBMS的无线帧,用来发送该 MBSFN区域的 MBMS业务。 为了描述方便, 假设某一 MBSFN区域承载的 MBMS的无线帧满足:
SFN mod radioFrameAllocatiorLPeriod=radioFrameAllocationOffset , 其中 radioFrameAllocationPeriod=4 , radioFrameAllocationOffset=0 , 并 且把该信息通过系统广播消息中的 SIB2发送给终端,得到用以承载 MBMS 的无线帧如图 3中阴影部分所示, 且每个承载 MBMS的无线帧内部至少有 一个子帧用以承载多小区模式的 MBMS的相关业务数据。
eNB将 radioFrameAllocationPeriod=4 , radioFrameAllocationOffset=0通 过系统广播消息发送给终端; 终端根据 SFN mod 4=0的换算关系, 可以解 析得到图 3中阴影部分所示的用以承载 MBMS的无线帧。
如果假设承载 MBMS 控制信道的无线帧和 /或子帧的出现的周期为 320ms , 换算到无线帧的个数, 即每隔 32个无线帧出现一次 MBMS控制信 道, 对应 PmcchPeriod=32。 eNB将配置的 PmcchPeriod=32 , PmcchOffset=0 携带在系统广播消息的系统信息块(SIB, System Information Block ) 中发 送给终端, 则终端根据 SFN mod 32=0 的换算关系, 可以解析得到承载 MBMS控制信道的无线帧如图 4中阴影部分所示, 确定为 SFN=0、 32、 64、 96等编号所对应的无线帧。
如果 eNB将配置的 PmcchPeriod=32 , PmcchOffset=4携带在系统广播 消息的 SIB中发送给终端, 则终端根据 SFN mod 32=4的换算关系, 可以解 析得到承载 MBMS 控制信道的无线帧如图 5 中阴影部分所示, 确定为 SFN=4、 36、 68、 100等编号所对应的无线帧。 如果 PmcchPeriod参数同时 表示承载在 MBMS控制信道的无线帧和 /或子帧上的 MBMS控制信令的重 复周期, 并约定重复周期是其修改周期的 4倍, 那么此时的 MBMS控制信 令的重复周期为 320ms( 32个无线帧) J爹改周期为 1280ms( 128个无线帧), 并且重复周期和修改周期,以及 MBMS控制信道的无线帧和 /或子帧相对于 SFN=0的无线帧的偏移信息均为 40ms ( 4个无线帧)。
如果 eNB将配置的 PmcchPeriod=16, PmcchOffset=0携带在系统广播 消息的 SIB中发送给终端, 则终端根据 SFN mod 16=0的换算关系, 可以解 析得到承载 MBMS 控制信道的无线帧如图 6 中阴影部分所示, 确定为 SFN=0、 16、 32、 48等编号所对应的无线帧。 如果 PmcchPeriod参数同时 表示承载在 MBMS控制信道的无线帧和 /或子帧上的 MBMS控制信令的重 复周期, 并约定重复周期是其修改周期的 4倍, 那么此时 MBMS控制信令 的重复周期为 160ms ( 16个无线帧), ^ί'爹改周期为 640ms ( 64个无线帧), 并且重复周期和修改周期,以及 MBMS控制信道的无线帧和 /或子帧相对于 SFN=0的无线帧的偏移信息均为 0ms (即 SFN=0的无线帧上有控制信道、 控制信令)。
如果 eNB将配置的 PmcchPeriod=16, PmcchOffset=4携带在系统广播 消息的 SIB中发送给终端, 则终端根据 SFN mod 16=4的换算关系, 可以解 析得到承载 MBMS 控制信道的无线帧如图 7 中阴影部分所示, 确定为 SFN=4、 20、 36、 52等编号所对应的无线帧。
如果 eNB将配置的 PmcchPeriod=16, PmcchOffset=8携带在系统广播 消息的 SIB中发送给终端, 则终端根据 SFN mod 16=8的换算关系, 可以解 析得到承载 MBMS 控制信道的无线帧如图 8 中阴影部分所示, 确定为 SFN=8、 24、 40、 56等编号所对应的无线帧。
实际应用中的 MBMS控制信道的无线帧分配情况还有很多, 在此不再 ——赘述。 此外, 如果协议中已经规定了 PmcchPeriod, 那么终端自然也知 道 PmcchPeriod 的取值, 从而不再需要 eNB 通知终端, eNB 只需将 PmcchOffset的取值发送给终端即可, 这样可以减少信令开销。
进一步的 ,该实施例中 eNB还可以向终端指明承载 MBMS控制信道的 子帧信息, 由终端从承载 MBMS 控制信道的无线帧内的相应子帧中读取 MBMS控制信令。 原则上, MBMS控制信令可以在 MBSFN无线帧内的任 一子帧上, 但是实际应用中会有一些约定的条件, 例如约定条件为: 当约 定 MBMS控制信道只能承载在系统配置的 MBSFN无线帧内的用于承载 MBMS业务的子帧上时,那么 MBMS控制信道只能被^^载在系统已经分配 好的 MBMS子帧上。 更具体的描述如图 9所示, 在该子帧的控制域中承载 一个包含用于标识 MBMS 控制信道的无线网络临时标识 (RNTI, Radio Network Temporary Identifier )的控制信息, 将 MBMS控制信令承载在该子 帧的数据域, 其中控制域的 RNTI用以帮助终端获取 MBMS控制信道的控 制信息, MBMS控制信道的控制信息进一步指示 MBMS控制信道在数据域 的具体位置等信息。 终端通过检测承载 MBMS控制信道的无线帧内的子帧 的控制域信息,以发现包含用于标识 MBMS控制信道的 RNTI的控制信息, 从而解析 MBMS控制信道的控制信息, 进一步依据控制信息确定 MBMS 控制信道的具体位置, 并在该位置上接收 MBMS控制信令、 并解析 MBMS 控制信令。
在本发明的实施例中, eNB通过 bitmap的方式、或指示子帧号的方式、 或固定子帧的方式向终端指明承载 MBMS控制信道的子帧信息。
所谓 bitmap的方式,如: 使用 1 Obit来描述图 3中指明的无线帧中用以 承载 MBMS控制信道的子帧, 假设承载在图 3所示的子帧 #1和子帧 #2上, 那么使用 bitmap的信令为 "0110000000" , 信令中的各个 bit依次对应从 #0 到 #9的各个子帧, 对应 bit置 "1 " 则表示该子帧承载 MBMS控制信道。
所谓指示子帧号的方式,即考虑到每个无线帧包含 10个子帧,需要 4bit 来区分表示各个子帧承载 MBMS控制信道, 例如: "0001" 表示子帧 #1上 承载 MBMS控制信道, "0010"表示子帧 #2上承载 MBMS控制信道。 依据 图 3所示, MBMS控制信道承载在子帧 #1和子帧 #2上时,使用指令为 "0001 , 0010" , 以告知终端。
所谓固定子帧的方式, 即在已经被指示为承载 MCCH的无线帧内, 固 定由一个或者多个子帧承载 MCCH, 这是 eNB和终端都默认的。 例如: 由 固定子帧 #1承载, 那么就在被指示为承载 MCCH的无线帧内的子帧 #1上 承载 MCCH。 这样就可以省去指示子帧位置的信令开销。
从上述的实施例中可以看出, PmcchPeriod和 PmcchOffset的配置都是 比较灵活的,这就给 eNB发送 MBMS控制信道提供了灵活性,可以灵活选 择无线帧, 便于 eNB进行调度。 但是实际应用中需要考虑到信令开销的问 题, 这会对承载 MBMS控制信道的无线帧选择造成一定的限制。
对于本发明的实施例中 PmcchOffset 的取值, 通常可以取小于 PmcchPeriod的任一正整数。 但是实际应用中, 为了便于 MBMS控制信令 的发送以及和 MBMS 业务的配合并且减少信令开销, 可以约定将 PmcchOffset和 radioFrameAllocationOffset的取值相同, 这样 PmcchOffset 的取值就不用通知终端了, 终端根据约定依据 radioFrameAllocationOffset 的取值可以直接获知 PmcchOffset 的取值。 这样虽然降低了本发明的灵活 性, 但是可以减少信令开销, 只需要在系统广播消息中通知 PmcchPeriod 给终端即可, PmcchOffset通过 radioFrameAllocationOffset隐含通知。
另外, PmcchPeriod也可以通过协议规定一个固定的值, 这样也可以减 少信令开销。 PmcchPeriod还可以和 radioFrameAllocationPeriod之间建立某 种对应关系,通过 radioFrameAllocationPeriod隐含通知。例如: PmcchPeriod 与 radioFrameAllocationPeriod 之间 为倍数关 系 ( PmcchPeriod 是 radioFrameAllocationPeriod 的 4 倍 ) , 从 而 只 需 通 知 radioFrameAllocationPeriod 和倍数关 系 " 4 " , 终端 即可以通过 radioFrameAllocationPeriod间接获知 PmcchPeriod的取值。
进一步的, 本发明实施例中可以设定 MBMS 控制信令在每个 PmcchPeriod都可以发生更新, 也可以设定连续几个 PmcchPeriod之后才能 发生更新。例如:根据 MBMS业务的特点以及 MBMS控制信令,设定 MBMS 控制信令为一个固定的周期, 优选为 320ms、 640ms, 160ms等。 如果设定 MBMS控制信令在连续几个重复周期内发送相同的内容, 不允许更新, 则 将连续的几个重复周期定义为一个修改周期, 只有修改周期到达时才能发 生更新。 例如: 规定 MBMS 控制信令的重复周期为 320ms, ^ί'爹改周期为 1280ms,这样连续 4个重复周期内 MBMS控制信令不允许更新。由于 MBMS 控制信令的重复周期信息承载在系统广播消息上, 因此较佳的, 设定承载 MBMS 控制信道的无线帧和 /或子帧上的控制信令的重复周期以及修改周 期分别与系统广播消息的重复周期以及修改周期一致; 或者设定承载 MBMS 控制信道的无线帧和 /或子帧上的控制信令的修改周期与系统广播 消息的修改周期一致。这样便于承载 MBMS控制信道的无线帧和 /或子帧上 的控制信令的重复周期或者修改周期发生变化时, 系统广播消息上用于指 示承载的 MBMS控制信道的重复周期或者修改周期的信息能够及时发生变 化。
对于控制信令承载在 DL-SCH 上的实施例, 与上述控制信令承载在 MCH 上的实施例基本类似, 在此不再赘述。 区别在于, 控制信令承载在 DL-SCH上的实施例, 其承载 MBMS控制信道的无线帧可以是非 MBSFN 无线帧,且换算关系只需 SFN mod PmcchPeriod=PmcchOffset,可以省去 SFN mod radioFrameAllocationPeriod=radioFrameAllocationOffset 々西己置过程。
为实现上述本发明的 MBMS控制信令的传输方法, 本发明还提供了一 种 MBMS控制信令的传输系统, 如图 10所示, 该系统由相连的网络侧 10 和终端 20组成。 网络侧 10, 用于通过高层信令将承载 MBMS控制信道的 无线帧和 /或子帧的指示信息发送给终端 20, 并通过承载 MBMS控制信道 的无线帧和 /或子帧向终端 20发送 MBMS控制信令。 终端 20, 用于根据获 取的无线帧和 /或子帧的指示信息,解析出承载 MBMS控制信道的无线帧和 /或子帧, 并从无线帧和 /或子帧中读取 MBMS控制信令。
本发明所指的 MBMS控制信道可以为: MCCH、 或者 P-MCCH、 或者 S-MCCH、 或者 MICH、 或者 MTCH。 承载 MBMS控制信道的无线帧和 /或子帧的指示信息至少包括下述之 一:包括承载 MBMS控制信道的无线帧和 /或子帧出现的周期信息和发送偏 移信息;包括承载在 MBMS控制信道的无线帧和 /或子帧上的控制信令的发 送偏移信息;还包括承载在 MBMS控制信道的无线帧和 /或子帧上的控制信 令的重复周期信息和修改周期信息;
承载 MBMS控制信道的无线帧和 /或子帧的指示信息还包括: MBSFN 无线帧周期和 MBSFN无线帧偏移。
综上所述, 通过本发明, 消除了系统侧发送 MBMS控制信令和终端接 收 MBMS控制信令的随机性, 降低终端的信令开销, 便于终端的省电; 此 夕卜,本发明中承载 MBMS控制信道的无线帧和 /或子帧的指示信息可以灵活 配置, 为网络侧发送 MBMS控制信令提供了灵活性; 本发明中承载 MBMS 控制信道的子帧可以灵活选择, 便于网络侧的调度。
以上所述, 仅为本发明的较佳实施例而已, 并非用于限定本发明的保 护范围。

Claims

权利要求书
1、 一种多媒体广播多播业务(MBMS )控制信令的传输方法, 其特征 在于, 该方法包括:
网络侧通过高层信令将承载 MBMS控制信道的无线帧和 /或子帧的指 示信息发送给终端,并通过所述承载 MBMS控制信道的无线帧和 /或子帧向 所述终端发送 MBMS控制信令;
所述终端根据获取的无线帧和 /或子帧的指示信息, 解析出承载所述 MBMS 控制信道的无线帧和 /或子帧, 并从所述无线帧和 /或子帧中读取 MBMS控制信令。
2、 根据权利要求 1所述 MBMS控制信令的传输方法, 其特征在于, 所述 MBMS控制信道为: 多播控制信道(MCCH )、 或者主多播控制信道
( P-MCCH )、或者次多播控制信道( S-MCCH )、或者多播指示信道( MICH )、 或者多播传输信道( MTCH )。
3、 根据权利要求 1所述 MBMS控制信令的传输方法, 其特征在于, 所述承载 MBMS控制信道的无线帧和 /或子帧的指示信息至少包括下述之 包括承载 MBMS控制信道的无线帧和 /或子帧出现的周期信息和发送 偏移信息;
还包括承载在 MBMS 控制信道的无线帧和 /或子帧上的控制信令的发 送偏移信息;
还包括承载在 MBMS 控制信道的无线帧和 /或子帧上的控制信令的重 复周期信息和修改周期信息;
所述承载 MBMS 控制信道的无线帧和 /或子帧的指示信息还包括: MBSFN无线帧周期和 MBSFN无线帧偏移。
4、 根据权利要求 3所述 MBMS控制信令的传输方法, 其特征在于, 所述根据无线帧的指示信息解析出承载 MBMS控制信道的无线帧,具体为: 根据换算关系 SFN mod PmcchPeriod=PmcchOffset、 即 SFN 模 PmcchPeriod等于 PmcchOffset,
和 SFN mod radioFrameAllocationPeriod=radioFrameAllocationOffset ¾即 SFN模 radioFrameAllocationPeriod等于 radioFrameAllocationOffset ,解析出 载 MBMS控制信道的无线帧;
其中, SFN表示系统帧号, 取值为正整数; radioFrameAllocationPeriod 表示 MBSFN无线帧周期; radioFrameAllocationOffset表示 MBSFN无线帧 偏移, 取值为大于或等于 0的整数, 且小于 radioFrameAllocationPeriod的 取值; PmcchPeriod表示承载 MBMS控制信道的无线帧和 /或子帧出现的周 期信息,取值为大于或等于 radioFrameAllocationPeriod的整数; PmcchOffset 表示承载 MBMS控制信道的无线帧和 /或子帧出现的发送偏移信息,相对于 SFN=0的无线帧的偏移, 取值为 0或小于 PmcchPeriod的正整数; mod表 示取模运算; 所述承载 MBMS 控制信道的无线帧即为满足换算关系 SFN mod PmcchPeriod=PmcchOffset, 或者同时满足上述两个换算关系的 SFN所 对应的无线帧。
5、 根据权利要求 3所述 MBMS控制信令的传输方法, 其特征在于, 该方法进一步包括至少下述步骤之一:
网络侧根据预设的所述发送偏移与 MBSFN无线帧偏移的对应关系,通 过 MBSFN无线帧偏移将所述发送偏移隐含通知给所述终端;
网络侧根据预设的所述重复周期与 MBSFN无线帧周期的对应关系,通 过 MBSFN无线帧周期将所述重复周期隐含通知给所述终端;
网络侧根据预设的所述重复周期与所述修改周期的对应关系, 通过重 复周期将所述修改周期隐含通知给所述终端;
网络侧根据预设的所述重复周期与所述修改周期的对应关系, 通过修 改周期将所述重复周期隐含通知给所述终端。
6、 根据权利要求 1所述 MBMS控制信令的传输方法, 其特征在于, 所述网络侧通过高层信令向终端发送承载 MBMS 控制信道的无线帧和 /或 子帧的指示信息为:
所述网络侧在通过高层信令通知承载 MBMS控制信道的无线帧信息的 基础上, 进一步在高层信令通过位图 (bitmap )的方式、 或通过高层信令指 示子帧号的方式、 或固定子帧的方式向终端指明承载 MBMS控制信道的无 线帧内具体承载 MBMS控制信道的子帧信息。
7、 根据权利要求 1至 6任一项所述 MBMS控制信令的传输方法, 其 特征在于, 所述高层信令为系统广播消息, 或者无线资源控制 (RRC ) 消 息, 或者专用信令。
8、 一种 MBMS控制信令的传输方法, 其特征在于, 该方法包括: 网络侧通过高层信令将承载 MBMS控制信道的无线帧和 /或子帧的指 示信息发送给终端,并通过所述承载 MBMS控制信道的无线帧和 /或子帧向 所述终端发送 MBMS控制信令。
9、 根据权利要求 8所述 MBMS控制信令的传输方法, 其特征在于, 所述 MBMS控制信道为: MCCH、 或者 P-MCCH、 或者 S-MCCH、 或者 MICH, 或者 MTCH。
10、 根据权利要求 8所述 MBMS控制信令的传输方法, 其特征在于, 所述承载 MBMS控制信道的无线帧和 /或子帧的指示信息至少包括下述之 包括承载 MBMS控制信道的无线帧和 /或子帧出现的周期信息和发送 偏移信息;
包括承载在 MBMS 控制信道的无线帧和 /或子帧上的控制信令的发送 偏移信息; 还包括承载在 MBMS 控制信道的无线帧和 /或子帧上的控制信令的重 复周期信息和修改周期信息;
所述承载 MBMS 控制信道的无线帧和 /或子帧的指示信息还包括: MBSFN无线帧周期和 MBSFN无线帧偏移。
11、 根据权利要求 10所述 MBMS控制信令的传输方法, 其特征在于, 该方法进一步包括至少下述步骤之一:
网络侧根据预设的所述发送偏移与 MBSFN无线帧偏移的对应关系,通 过 MBSFN无线帧偏移将所述发送偏移隐含通知给所述终端;
网络侧根据预设的所述重复周期与 MBSFN无线帧周期的对应关系,通 过 MBSFN无线帧周期将所述重复周期隐含通知给所述终端;
网络侧根据预设的所述重复周期与所述修改周期的对应关系, 通过重 复周期将所述修改周期隐含通知给所述终端;
网络侧根据预设的所述重复周期与所述修改周期的对应关系, 通过修 改周期将所述重复周期隐含通知给所述终端。
12、 根据权利要求 8所述 MBMS控制信令的传输方法, 其特征在于, 所述网络侧通过高层信令向终端发送承载 MBMS 控制信道的无线帧和 /或 子帧的指示信息为:
所述网络侧在通过高层信令通知承载 MBMS控制信道的无线帧信息的 基础上, 进一步在高层信令通过 bitmap的方式、 或指示子帧号的方式、 或 固定子帧的方式向终端指明承载 MBMS 控制信道的无线帧内具体承载 MBMS控制信道的子帧信息。
13、 根据权利要求 8至 12任一项所述 MBMS控制信令的传输方法, 其特征在于, 所述高层信令为系统广播消息, 或者 RRC消息, 或者专用信 令。
14、 一种 MBMS控制信令的传输方法, 其特征在于, 该方法包括: 终端通过高层信令获取来自网络侧的承载 MBMS控制信道的无线帧和 /或子帧的指示信息;
所述终端根据获取的无线帧和 /或子帧的指示信息, 解析出承载所述 MBMS 控制信道的无线帧和 /或子帧, 并从所述无线帧和 /或子帧中读取 MBMS控制信令。
15、 根据权利要求 14所述 MBMS控制信令的传输方法, 其特征在于, 所述 MBMS控制信道为: MCCH、 或者 P-MCCH、 或者 S-MCCH、 或者 MICH, 或者 MTCH。
16、 根据权利要求 14所述 MBMS控制信令的传输方法, 其特征在于, 所述承载 MBMS控制信道的无线帧和 /或子帧的指示信息至少包括下述之 包括承载 MBMS控制信道的无线帧和 /或子帧出现的周期信息和发送 偏移信息;
包括承载在 MBMS 控制信道的无线帧和 /或子帧上的控制信令的发送 偏移信息;
还包括承载在 MBMS 控制信道的无线帧和 /或子帧上的控制信令的重 复周期信息和修改周期信息;
所述承载 MBMS 控制信道的无线帧和 /或子帧的指示信息还包括: MBSFN无线帧周期和 MBSFN无线帧偏移。
17、 根据权利要求 16所述 MBMS控制信令的传输方法, 其特征在于, 所述根据无线帧的指示信息解析出承载 MBMS控制信道的无线帧,具体为: 根据换算关系 SFN mod PmcchPeriod=PmcchOffset、 即 SFN 模 PmcchPeriod等于 PmcchOffset,
和 SFN mod radioFrameAllocationPeriod=radioFrameAllocationOffset ¾即 SFN模 radioFrameAllocationPeriod等于 radioFrameAllocationOffset ,解析出 承载 MBMS控制信道的无线帧; 其中, SFN表示系统帧号,取值为正整数; radioFrameAllocationPeriod 表 示 MBSFN 无 线 帧 周 期 ; radioFrameAllocationOffset表示 MBSFN无线帧偏移, 取值为大于或等于 0 的整数 , 且小于 radioFrameAllocationPeriod的取值; PmcchPeriod表示承载 MBMS 控制信道的无线帧和 /或子帧出现的周期信息, 取值为大于或等于 radioFrameAllocationPeriod的整数; PmcchOffset表示 载 MBMS控制信道 的无线帧和 /或子帧出现的发送偏移信息, 相对于 SFN=0的无线帧的偏移, 取值为 0或小于 PmcchPeriod的正整数; mod表示取模运算;所述承载 MBMS 控制信道的无线帧即为满足换算关系 SFN mod PmcchPeriod=PmcchOffset , 或者同时满足上述两个换算关系的 SFN所对应的无线帧。
18、 根据权利要求 14至 17任一项所述 MBMS控制信令的传输方法, 其特征在于, 所述高层信令为系统广播消息, 或者 RRC消息, 或者专用信 令。
19、 一种 MBMS控制信令的传输系统, 其特征在于, 该系统包括相连 的网络侧和终端, 其中,
所述网络侧, 用于通过高层信令将承载 MBMS 控制信道的无线帧和 / 或子帧的指示信息发送给终端, 并通过所述承载 MBMS控制信道的无线帧 和 /或子帧向所述终端发送 MBMS控制信令;
所述终端, 用于根据获取的无线帧和 /或子帧的指示信息, 解析出承载 所述 MBMS控制信道的无线帧和 /或子帧, 并从所述无线帧和 /或子帧中读 取 MBMS控制信令。
20、 根据权利要求 19所述 MBMS控制信令的传输系统, 其特征在于, 所述 MBMS控制信道为: MCCH、 或者 P-MCCH、 或者 S-MCCH、 或者 MICH, 或者 MTCH。
21、 根据权利要求 19所述 MBMS控制信令的传输系统, 其特征在于, 所述承载 MBMS控制信道的无线帧和 /或子帧的指示信息至少包括下述之 包括承载 MBMS控制信道的无线帧和 /或子帧出现的周期信息和发送 偏移信息;
包括承载在 MBMS 控制信道的无线帧和 /或子帧上的控制信令的发送 偏移信息;
还包括承载在 MBMS 控制信道的无线帧和 /或子帧上的控制信令的重 复周期信息和修改周期信息;
所述承载 MBMS 控制信道的无线帧和 /或子帧的指示信息还包括: MBSFN无线帧周期和 MBSFN无线帧偏移。
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