CN106358317B - A kind of method and system for realizing LTE air interface multicast - Google Patents
A kind of method and system for realizing LTE air interface multicast Download PDFInfo
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- CN106358317B CN106358317B CN201610837356.XA CN201610837356A CN106358317B CN 106358317 B CN106358317 B CN 106358317B CN 201610837356 A CN201610837356 A CN 201610837356A CN 106358317 B CN106358317 B CN 106358317B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/10—Connection setup
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/10—Connection setup
- H04W76/11—Allocation or use of connection identifiers
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- H—ELECTRICITY
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- H04W76/40—Connection management for selective distribution or broadcast
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Abstract
The invention discloses a kind of method and system for realizing LTE air interface multicast, the method is by the ERAB that 4G core net is that the user equipment foundation for having multicast requirement is used for bear multicast data；User equipment addition group sowing time, 4G core net send ERAB modification request to LTE base station；LTE base station generates semi-persistent scheduling radio network temporary identifier according to the address mapping information of ERAB modification request, and indicates that user equipment establishes semi-persistent scheduling；User equipment receives the semi-persistent scheduling radio network temporary identifier, carries out RRC connection reconfiguration to establish semi-persistent scheduling, and feeds back semi-persistent scheduling and establish the message completed to LTE base station, and then multicast is added.It follows that supporting the user equipment of LTE that multicast can be added, scheduling is flexibly simple, improves the scope of application of LTE air interface multicast.
Description
Technical field
The present invention relates to the communications field, in particular to a kind of method and system for realizing LTE air interface multicast.
Background technique
Broadband cluster communication standard " broadband cluster communication (B-TrunC) system interface technical requirements based on LTE technology
(first stage) air interface " using G-RNTI realization air interface multicast, but the standard needs to modify terminal protocol stack,
Only dedicated mobile phone could support the agreement, cause existing partial movement terminal that can not carry out multicast.
As it can be seen that the prior art could be improved and improve.
Summary of the invention
Place in view of above-mentioned deficiencies of the prior art, the purpose of the present invention is to provide a kind of realization LTE air interface groups
The method and system broadcast, scheduling is flexibly simple, supports the user equipment of LTE that can support multicast.
In order to achieve the above object, this invention takes following technical schemes:
A method of it realizing LTE air interface multicast, includes the following steps:
A, 4G core net is to have the user equipment of multicast requirement to establish the ERAB for being used for bear multicast data；
B1, user equipment addition group sowing time, 4G core net to LTE base station send modification ERAB with complete IP multicast address to
The ERAB of the mapping of C-RNTI modifies request；;
B2, LTE base station generate semi-persistent scheduling wireless network according to the address mapping information of ERAB modification request and face
When identifier, and indicate that user equipment establishes semi-persistent scheduling;
B3, user equipment receive the semi-persistent scheduling radio network temporary identifier, carry out RRC connection reconfiguration to establish
Semi-persistent scheduling, and feed back semi-persistent scheduling and establish the message completed to LTE base station；
B4, LTE base station notice 4G core net ERAB modification are completed, and multicast is added in user equipment.
In the method for the realization LTE air interface multicast, the step A specifically includes step:
A1,4G core net send ERAB and establish request to LTE base station, it is desirable that establish ERAB；
A2, LTE base station send M-DRB and increase instruction to user equipment, to indicate that user equipment establishes M-DRB；
After A3, user equipment receive the M-DRB increase instruction, M-DRB is established by RRC connection reconfiguration, and feed back
M-DRB establishes the message completed to LTE base station；
A4, LTE base station are established response notice 4G core net M-DRB foundation using ERAB and are completed.
Further include following steps after the step B4 in the method for the realization LTE air interface multicast:
C1, user equipment exit a group sowing time, 4G core net send make user equipment exit multicast ERAB modification request to
LTE base station；
C2, LTE base station are modified according to the ERAB and are requested, and are sent semi-persistent scheduling and are released order to user equipment；
C3, user equipment receive after semi-persistent scheduling releases order, and discharge semi-persistent scheduling by RRC connection reconfiguration,
It does not use semi-persistent scheduling radio network temporary identifier and receives data, to exit multicast.
In the method for the realization LTE air interface multicast, when LTE base station needs to transmit downlink multicast data, make
Data are received with the down link control information notifying user equipment of activation semi-persistent scheduling；After completing data transmission, using going
The down link control information notifying user equipment of semi-persistent scheduling is activated to stop receiving data.
A kind of system for realizing LTE air interface multicast, the system comprises:
4G core net, for for have the user equipment of multicast requirement establish be used for bear multicast data ERAB；In user
Equipment addition group sowing time sends modification ERAB to LTE base station to complete the ERAB modification of the mapping of IP multicast address to C-RNTI
Request；
LTE base station, it is interim for generating semi-persistent scheduling wireless network according to the address mapping information of ERAB modification request
Identifier, and indicate that user equipment establishes semi-persistent scheduling；
User equipment carries out RRC connection reconfiguration for receiving the semi-persistent scheduling radio network temporary identifier to build
Vertical semi-persistent scheduling, and feed back semi-persistent scheduling and establish the message completed to LTE base station.
In the system for realizing LTE air interface multicast, the 4G core net is to have the user of multicast requirement
When equipment establishes the ERAB for being used for bear multicast data, sends ERAB and establish request to LTE base station, it is desirable that establish ERAB；It is described
LTE base station is also used to after receiving ERAB and establishing request, is sent M-DRB and is increased instruction to user equipment, to indicate that user sets
It is standby to establish M-DRB；And after user equipment completes M-DRB foundation, response notice 4G core net M-DRB is established using ERAB and is established
It completes；The user equipment is also used to after receiving the M-DRB and increasing instruction, establishes M-DRB by RRC connection reconfiguration,
And it feeds back M-DRB and establishes the message completed to LTE base station.
In the system of the realization LTE air interface multicast, the 4G core net is also used to exit group in user equipment
Sowing time sends the ERAB modification request for making user equipment exit multicast to LTE base station, it is desirable that modification ERAB exits user equipment
Multicast；The LTE base station is also used to after receiving the ERAB for making user equipment exit multicast modification request, sends semi-static tune
Degree releases order to user equipment；The user equipment is also used to after receiving semi-persistent scheduling and releasing order, and is connected by RRC
Reconfiguration release semi-persistent scheduling is connect, semi-persistent scheduling radio network temporary identifier is not used and receives data, to exit group
It broadcasts.
In the system of the realization LTE air interface multicast, when LTE base station needs to transmit downlink multicast data, make
Data are received with the down link control information notifying user equipment of activation semi-persistent scheduling；After completing data transmission, using going
The down link control information notifying user equipment of semi-persistent scheduling is activated to stop receiving data.
The utility model has the advantages that
A kind of method and system for realizing LTE air interface multicast provided by the invention, the method are by 4G core net
There is the user equipment of multicast requirement to establish the ERAB for being used for bear multicast data；User equipment addition group sowing time, 4G core net to
LTE base station sends ERAB modification request；LTE base station generates semi-static tune according to the address mapping information of ERAB modification request
Radio network temporary identifier is spent, and indicates that user equipment establishes semi-persistent scheduling；User equipment receives the semi-persistent scheduling
Radio network temporary identifier carries out RRC connection reconfiguration to establish semi-persistent scheduling, and feeds back semi-persistent scheduling and establish completion
Multicast is added to LTE base station in message.It follows that supporting the user equipment of LTE that multicast can be added, flexibly letter is dispatched
It is single, improve the scope of application of LTE air interface multicast.
Detailed description of the invention
Fig. 1 is the method flow diagram provided by the invention for realizing LTE air interface multicast.
Fig. 2 is in the method provided by the invention for realizing LTE air interface multicast, and the process that multicast is added in user equipment is shown
It is intended to.
Fig. 3 is to establish the flow diagram of M-DRB in the method provided by the invention for realizing LTE air interface multicast.
Fig. 4 is in the method provided by the invention for realizing LTE air interface multicast, and the process that user equipment exits multicast is shown
It is intended to.
Specific embodiment
The present invention provides a kind of method and system for realizing LTE air interface multicast, to make the purpose of the present invention, technical side
Case and effect are clearer, clear, and the present invention is described in more detail as follows in conjunction with drawings and embodiments.It should be appreciated that
Described herein specific examples are only used to explain the present invention, is not intended to limit the present invention.
According to 3GPP TS 36.213 7.1, when user equipment (User Equipment, UE) high level be configured with it is semi-static
When dispatching radio network temporary identifier (SPS C-RNTI), UE should use SPS C-RNTI to downlink physical control channel
(PDCCH) and corresponding downlink physical is shared channel (PDSCH) and is decoded；The Cyclic Redundancy Check of the PDCCH
It is scrambled by SPS C-RNTI.Actually in LTE system, down link control information (DCI) indicates UE in corresponding subframe
All necessary informations such as PDSCH physical layer resources and transformat, PDCCH carry DCI, while the CRC of PDCCH and right
Answer PDSCH to be scrambled by corresponding RNTI, therefore it is presently believed that RNTI LTE physical layer effect, be equivalent to MAC Address with
Effect too in net.Therefore, RRC(wireless heterogeneous networks of the present invention) identical SPS C-RNTI is configured to several by agreement
UE, these UE are formed a multicast group, to realize multicast.The RRC agreement (RRC) is responsible for the management of RRC connection,
According to 36.331 5.3.1 of 3GPP TS, the management of M-DRB is realized by RRC connection reconfiguration.
Multicast is a kind of one or more senders' (multicast source) to be allowed to send single data packet to multiple recipients (one
It is secondary, at the same) network technology.Data packet is sent to particular multicast group by multicast source, and only belongs to the ground of the multicast group
Location can just receive data packet.For cable network, there are a set of IP address allocation strategy and by three IP multicast of layer
Location is mapped to the mechanism of two ethernet address of layer；It mainly includes that multicast is added that it, which is managed, exits multicast etc..The air interface of LTE,
It is equivalent to Ethernet (layer two).Realize multicast, it is only necessary to three address of complete layer to the function of the two address mapping of layer, i.e. terminal
Multicast is being added and is exiting a group sowing time, the mapping of three address of LTE air interface complete layer to layer double-address (C-RNTI).Together
When, in up direction, that is, terminal to base station direction, always one-to-one to carry out data transmission, no multicast requirement；Multicast application is under
Line direction, that is, base station to terminal direction, i.e., multiple terminals receive downlink multicast data using identical physical layer resources.The present invention
Use dedicated M-DRB(multicast packet radio bearer) bear multicast data, address of cache by RRC to the management of M-DRB and
MAC protocol is to SPS(editions static schedulings) activation and deactivate realize.The MAC completes the function of wireless resource scheduling.
Specifically, referring to Fig. 1, the present invention provides a kind of method for realizing LTE air interface multicast, the method includes
Following steps:
S10,4G core net (EPC) are to have the user equipment of multicast requirement to establish to drill for the ERAB(of bear multicast data
Into radio access bearer).In the present embodiment, the user equipment is the mobile terminal with LTE function.
S210, user equipment addition group sowing time, 4G core net send modification ERAB(evolution to LTE base station (eNodeB)
Radio access bearer) to complete IP multicast address to C-RNTI(radio network temporary identifier) mapping ERAB modification ask
It asks, it is desired to modify ERAB with three address of complete layer to the two address mapping of layer.
S220, LTE base station generate semi-persistent scheduling wireless network according to the address mapping information of ERAB modification request
Temporary identifier (SPS C-RNTI), and indicate that user equipment establishes semi-persistent scheduling (SPS).Specifically, eNodeB according to
The address mapping information of ERAB modification request generates SPS C-RNTI, and indicates that UE is established by message RRC connection reconfiguration message
SPS prepares to receive by the scrambled multicast packet of SPS C-RNTI.
S230, user equipment receive the semi-persistent scheduling radio network temporary identifier, carry out RRC connection reconfiguration to build
Vertical semi-persistent scheduling, and feed back semi-persistent scheduling (SPS) and establish the message completed to LTE base station.
The ERAB modification of S240, LTE base station notice 4G core network user equipment are completed, and multicast is added in user equipment.
Referring to Fig. 2, the step S210 to S240 is the process that multicast is added in user equipment.It follows that supporting LTE
User equipment can be added multicast, scheduling is flexibly simple, improves the scope of application of LTE air interface multicast.
Further, referring to Fig. 3, the step S10 specifically includes step:
S110,4G core net send ERAB and establish request to LTE base station, it is desirable that establish ERAB, be used for bear multicast data；
The ERAB is user equipment by LTE base station to the data path between 4G core net.
S120, LTE base station send M-DRB and increase instruction to user equipment, to indicate that user equipment establishes M-DRB；It is described
M-DRB refers to that user equipment to the data path between LTE base station, is equivalent to one section of ERAB.
After S130, user equipment receive the M-DRB increase instruction, M-DRB is established by RRC connection reconfiguration, and anti-
It presents M-DRB and establishes the message completed to LTE base station；
S140, LTE base station are established ERAB of the response notice 4G core net for bear multicast data using ERAB and have been established
At.
Further, the invention also includes the processes for exiting multicast, that is, further includes walking as follows after the step S240
It is rapid:
S310, user equipment exit a group sowing time, and 4G core net sends the ERAB modification request for making user equipment exit multicast
To LTE base station；
S320, LTE base station are modified according to the ERAB and are requested, and are sent semi-persistent scheduling and are released order to user equipment；
S330, user equipment receive after semi-persistent scheduling releases order, and pass through RRC connection reconfiguration and discharge semi-static tune
Degree does not use semi-persistent scheduling radio network temporary identifier and receives data, to exit multicast, and uses RRC connection weight
With completion notice eNodeB；
S340, LTE base station send ERAB modification response notice 4G core network user equipment and have dropped out multicast.
For the angle that mobile terminal economizes on electricity, when down direction has data transmission, mobile terminal just needs to receive number
According to for SPS (semi-persistent scheduling), the present invention devises SPS activation and deactivated mechanism.According to 3GPP TS 36.213
9.2, when activation SPS is transmitted, need to scramble PDCCH using SPS C-RNTI；Secondly, NDI field is set as 0, this is two
A primary condition.For further stringent verifying, need to examine DCI(down link control information) in other fields.
DCI format is bit stream, and wherein 1 content of DCI format is as follows:
Resource allocation type 0 or 1:1 bit；
Resource block distribution and Modulation and Coding Scheme: 5 bits；
HARQ(hybrid automatic repeat-request) process number: TDD(time division duplex) 4 bits；FDD(frequency division duplex) 3 ratios
It is special；
New data instruction: 1 bit；
Redundancy versions: 2 bits；
PUCCH(physical uplink control channel) transmission power control command: 2 bits；
Downlink distribution index: 2 bits.
DCI format 1A content is as follows:
Localized and distributed virtual wireless resource block assignment flag: 1 bit；
Resource block distribution and Modulation and Coding Scheme: 5 bits；
HARQ process number: 4 bit of TDD；3 bit of FDD；
New data instruction: 1 bit；
Redundancy versions: 2 bits；
PUCCH transmission power control command: 2 bits；
Downlink distribution index: 2 bits.
MAC activates SPS to transmit using the DCI format 1 of specific content or DCI format 1A, and DCI need to be especially arranged such as table one
It is shown:
The DCI of the activation of table one SPS.
MAC deactivates SPS transmission using the DCI format 1A of specific content, and DCI need to be especially provided that
The DCI of the deactivation of table two SPS.
When LTE base station needs to transmit downlink multicast data, the down link control information of activation semi-persistent scheduling is used
(DCI) notifying user equipment receives data；After completing data transmission, letter is controlled using the downlink for deactivating semi-persistent scheduling
Notifying user equipment is ceased to stop receiving data.So set, being conducive to power saving.
The method of the realization LTE air interface multicast provided based on the above embodiment, the present invention also provides a kind of realization LTE
The system of air interface multicast, the system comprises 4G core net as described above, LTE base station as described above and as described above
User equipment.
The 4G core net, for for have the user equipment of multicast requirement establish be used for bear multicast data ERAB；?
User equipment addition group sowing time, it is interim to C-RNTI(wireless network to complete IP multicast address to send modification ERAB to LTE base station
Identifier) mapping ERAB modify request.
The LTE base station, for generating semi-persistent scheduling wireless network according to the address mapping information of ERAB modification request
Temporary identifier (SPS C-RNTI), and indicate that user equipment establishes semi-persistent scheduling (SPS).
The user equipment carries out RRC connection reconfiguration for receiving the semi-persistent scheduling radio network temporary identifier
To establish semi-persistent scheduling, and feeds back semi-persistent scheduling (SPS) and establish the message completed to LTE base station.
The 4G core net is when having the user equipment of multicast requirement to establish the ERAB for being used for bear multicast data, to send
ERAB establishes request to LTE base station, it is desirable that establishes ERAB.The LTE base station is also used to after receiving ERAB and establishing request, hair
M-DRB is sent to increase instruction to user equipment, to indicate that user equipment establishes M-DRB；And M-DRB is completed in user equipment and is established
Afterwards, response notice 4G core net M-DRB is established using ERAB establish completion.The user equipment is also used to receiving the M-
After DRB increases instruction, M-DRB is established by RRC connection reconfiguration, and feeds back M-DRB and establishes the message completed to LTE base station.
The 4G core net is also used to exit a group sowing time in user equipment, and the ERAB that sending makes user equipment exit multicast is repaired
Change request to LTE base station, it is desirable that modification ERAB makes user equipment exit multicast.The LTE base station is also used to receiving use
After family equipment exits the ERAB modification request of multicast, sends semi-persistent scheduling and release order to user equipment.The user equipment
It is also used to after receiving semi-persistent scheduling and releasing order, semi-persistent scheduling is discharged by RRC connection reconfiguration, it is quiet not use half
State dispatches radio network temporary identifier and receives data, to exit multicast.
When LTE base station needs to transmit downlink multicast data, the down link control information of activation semi-persistent scheduling is used
(DCI) notifying user equipment receives data；After completing data transmission, letter is controlled using the downlink for deactivating semi-persistent scheduling
Notifying user equipment is ceased to stop receiving data.
It follows that supporting the user equipment of LTE all in the system provided by the invention for realizing LTE air interface multicast
Multicast can be added, scheduling is flexibly simple, improves the scope of application of LTE air interface multicast.The characteristics of due to the system with
And principle is corresponding with embodiment of the method, therefore details are not described herein.
It, can according to the technique and scheme of the present invention and its hair it is understood that for those of ordinary skills
Bright design is subject to equivalent substitution or change, and all these changes or replacement all should belong to the guarantor of appended claims of the invention
Protect range.
Claims (6)
1. a kind of method for realizing LTE air interface multicast, which comprises the steps of:
A, 4G core net is to have the user equipment of multicast requirement to establish the ERAB for being used for bear multicast data；
The step A specifically includes step:
A1,4G core net send ERAB and establish request to LTE base station, it is desirable that establish ERAB；
A2, LTE base station send M-DRB and increase instruction to user equipment, to indicate that user equipment establishes M-DRB；
After A3, user equipment receive the M-DRB increase instruction, M-DRB is established by RRC connection reconfiguration, and feed back M-DRB
The message completed is established to LTE base station；
A4, LTE base station are established response notice 4G core net M-DRB foundation using ERAB and are completed；
B1, user equipment addition group sowing time, 4G core net send modification ERAB to LTE base station to complete IP multicast address to C-
The ERAB of the mapping of RNTI modifies request；
B2, LTE base station generate semi-persistent scheduling wireless network according to the address mapping information of ERAB modification request and temporarily mark
Know symbol, and indicates that user equipment establishes semi-persistent scheduling;
B3, user equipment receive the semi-persistent scheduling radio network temporary identifier, and it is quiet to establish half to carry out RRC connection reconfiguration
State scheduling, and feed back semi-persistent scheduling and establish the message completed to LTE base station；
B4, LTE base station notice 4G core net ERAB modification are completed, and multicast is added in user equipment.
2. the method according to claim 1 for realizing LTE air interface multicast, which is characterized in that after the step B4,
Further include following steps:
C1, user equipment exit a group sowing time, and 4G core net sends the ERAB modification request for making user equipment exit multicast and gives LTE base
It stands；
C2, LTE base station are modified according to the ERAB and are requested, and are sent semi-persistent scheduling and are released order to user equipment；
C3, user equipment receive after semi-persistent scheduling releases order, and discharge semi-persistent scheduling by RRC connection reconfiguration, no longer
Data are received using semi-persistent scheduling radio network temporary identifier, to exit multicast.
3. the method according to claim 1 for realizing LTE air interface multicast, which is characterized in that when LTE base station needs to pass
When defeated downlink multicast data, data are received using the down link control information notifying user equipment of activation semi-persistent scheduling；It is complete
After transmitting at data, stop receiving data using the down link control information notifying user equipment for deactivating semi-persistent scheduling.
4. a kind of system for realizing LTE air interface multicast, which is characterized in that the system comprises:
4G core net, for for have the user equipment of multicast requirement establish be used for bear multicast data ERAB；In user equipment
Addition group sowing time sends modification ERAB to LTE base station to complete the ERAB modification request of the mapping of IP multicast address to C-RNTI；
The 4G core net is when having the user equipment of multicast requirement to establish the ERAB for being used for bear multicast data, to send ERAB and build
It is vertical to request to LTE base station, it is desirable that establish ERAB；The LTE base station is also used to after receiving ERAB and establishing request, sends M-
DRB increases instruction to user equipment, to indicate that user equipment establishes M-DRB；And after user equipment completes M-DRB foundation, make
Response notice 4G core net M-DRB, which is established, with ERAB establishes completion；The user equipment is also used to receiving the M-DRB increasing
After adding instruction, M-DRB is established by RRC connection reconfiguration, and feeds back M-DRB and establishes the message completed to LTE base station；
LTE base station, for generating semi-persistent scheduling radio network temporary identifier according to the address mapping information of ERAB modification request
Symbol, and indicate that user equipment establishes semi-persistent scheduling；
User equipment carries out RRC connection reconfiguration for receiving the semi-persistent scheduling radio network temporary identifier to establish half
Static scheduling, and feed back semi-persistent scheduling and establish the message completed to LTE base station.
5. the system according to claim 4 for realizing LTE air interface multicast, which is characterized in that the 4G core net is also
For exiting a group sowing time in user equipment, the ERAB modification request for making user equipment exit multicast is sent to LTE base station, it is desirable that repair
Changing ERAB makes user equipment exit multicast；The LTE base station is also used to repair receiving the ERAB for making user equipment exit multicast
After changing request, sends semi-persistent scheduling and release order to user equipment；The user equipment is also used to receiving semi-static tune
After degree releases order, semi-persistent scheduling is discharged by RRC connection reconfiguration, does not use semi-persistent scheduling radio network temporary identifier
Symbol receives data, to exit multicast.
6. the system according to claim 4 for realizing LTE air interface multicast, which is characterized in that when LTE base station needs to pass
When defeated downlink multicast data, data are received using the down link control information notifying user equipment of activation semi-persistent scheduling；It is complete
After transmitting at data, stop receiving data using the down link control information notifying user equipment for deactivating semi-persistent scheduling.
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