CN107027190A - A kind of Stochastic accessing contention resolved implementation method for LTE system - Google Patents
A kind of Stochastic accessing contention resolved implementation method for LTE system Download PDFInfo
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- CN107027190A CN107027190A CN201710449236.7A CN201710449236A CN107027190A CN 107027190 A CN107027190 A CN 107027190A CN 201710449236 A CN201710449236 A CN 201710449236A CN 107027190 A CN107027190 A CN 107027190A
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- 230000011664 signaling Effects 0.000 claims abstract description 60
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- 238000012545 processing Methods 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
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- 230000003190 augmentative effect Effects 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access
- H04W74/08—Non-scheduled access, e.g. ALOHA
- H04W74/0833—Random access procedures, e.g. with 4-step access
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Abstract
The present invention proposes a kind of Stochastic accessing contention resolved implementation method for LTE, contention resolved mark and RRC connections are set up into signaling separately send, it is included in msg4 and only carries contention resolved mark and issued by L2, RRC connections is set up signaling and issued as UE ordinary signaling by L3；Msg4 is directly transmitted after L2 MAC layer receives msg3, L3 is not involved in msg4 transmission, and UE is received after contention resolved mark, and contention resolved success is thought in base station, and RRC connections are set up signaling as an ordinary signaling and are handed down to UE by L3.This invention simplifies the flow that msg4 is issued, RRC connections are set up signaling and no longer limited by contention resolved timer, reduce the disposal ability requirement to L3, the rate of being successfully accessed are improved, with important market value.
Description
Technical field
It is real more particularly, to a kind of Stochastic accessing contention resolved for LTE system the present invention relates to moving communicating field
Existing method.
Background technology
The radio interface protocol layer of LTE system is divided into three layers.L1 is physical layer (PHY), and L2 includes medium education
(MAC), wireless spread-spectrum technology (RLC) and packet data convergence (PDCP), L3 are wireless heterogeneous networks (RRC) layer
In LTE communication system, Stochastic accessing is divided into competition and non-competing Stochastic accessing, referring to Fig. 2, competes Stochastic accessing
Main flow it is as follows：
Initial competitor random access procedure is broadly divided into four steps, and UE initiates msg1, and base station is sent after receiving in msg2, msg2
Mainly include temp-rnti, ta and msg3 uplink authorization, UE is received and msg3 is initiated after msg2, competition solution is included in msg3
Award of bid is known, and UE can start contention resolved timer after msg3 is sent, if do not received at the appointed time one's own
Msg4, then it is assumed that contention resolved fails.Base station is received after msg3, if identified in msg3 comprising contention resolved, in msg4
This contention resolved can be identified and UE is then forwarded to by MAC CE, when UE receives the msg4 with oneself mark, be considered as competition
Solve successfully.In Msg4 in addition to comprising contention resolved mark, general method is that some signalings also can together be passed in msg4
Give UE.The content that msg4 is included in initial random access procedure is that contention resolved is identified and signaling is set up in RRC connections.
The signaling carried in Msg4 is that the L3 of base station side is received after msg3, and this UE RRC connections are set up into signaling is sent to
L2, eventually through being sent to UE after MAC layer dispatching multiplex.When the UE of same period request is excessive, L3 processing
Load is excessive, may result in L3 and some UE RRC connections are set up into L2 and UE that base station is issued in signaling delay, when delay is more than UE
Contention resolved timer duration when, contention resolved failure.
LTE associative keys are as follows：
The content of the invention
In order to solve the same period accesses of a large amount of UE, the load of L3 processing is excessive, and processing time is oversize, causes UE competing
Msg4 is not received also when striving solution timer expiry and contention resolved the problem of fail, the present invention proposes a kind of to be used for LTE system
Stochastic accessing contention resolved implementation method.
Technical solution of the present invention provides a kind of Stochastic accessing contention resolved implementation method for LTE, by contention resolved mark
Know and signaling separately send is set up in RRC connections, be included in msg4 and only carry contention resolved mark and issued by L2, RRC connections
Set up signaling to be issued by L3 as UE ordinary signaling, implementation is as follows, directly transmitted after L2 MAC layer receives msg3
Msg4, L3 are not involved in msg4 transmission；UE is received after contention resolved mark, and contention resolved success is thought in base station, and L3 connects RRC
Connect and set up signaling as an ordinary signaling and be handed down to UE.
Moreover, for initial random access scene.
Moreover, the contention resolved sent in msg4 is designated the contention resolved mark carried in the msg3 that base station is received.
Moreover, the contention resolved mark in msg4 is sent by MAC CE.
Moreover, the reception and transmission of contention resolved mark are without L3.
Moreover, after base station sends msg4 to UE, waiting UE to be properly received after msg4 and feeding back ACK and issuing RRC connections foundation
Signaling.
Moreover, after base station sends msg4 to UE, if UE is not properly received msg4, MAC receive for NACK, base station pair
Msg4 is retransmitted.
Moreover, if msg4 reaches maximum retransmission, UE is still not properly received msg4, and msg4 timers to be waited surpass
Shi Hou, this UE contention resolved failure, initiates Stochastic accessing again.
Moreover, RRC connections set up signaling received by L3 the RRC connections carried in msg3 set up after demand signalling produce, L3
This signaling is sent to RLC, PHY is sent to by MAC scheduling, is sent after PHY modulation.
Moreover, if UE, which is not properly received RRC connections, sets up signaling, UE reports NACK to base station, and MAC layer is carried out to this signaling
Retransmit；Until reaching maximum retransmission, UE is not properly received also, then UE will not send RRC connections and set up completion signaling to base
Stand；If base station side L3 does not receive the signaling before completion timing device time-out is set up in RRC connections, RRC connections can be issued and released
Message is put, UE needs to initiate Stochastic accessing again.
This invention simplifies the flow that msg4 is issued, RRC connections are set up signaling and no longer limited by contention resolved timer,
The disposal ability requirement to L3 is reduced, the rate of being successfully accessed is improved, acts on notable in augmentative communication systems, with important
Market value.
Brief description of the drawings
Fig. 1 is the process principle figure of the embodiment of the present invention.
Fig. 2 is the initial competitor random access procedure schematic diagram of prior art.
Embodiment
Describe the embodiment of the present invention in detail below in conjunction with drawings and examples.
The present invention proposes a kind of Stochastic accessing contention resolved implementation method for LTE system, including by contention resolved mark
Know and signaling separately send is set up in RRC connections：Contention resolved mark is only carried in msg4, is issued by L2；Signaling is set up in RRC connections
Issued as UE ordinary signaling by L3.Because the contention resolved in msg3 is identified by MAC CE and issues base station,
Participation of the msg4 transmission without L3, can just directly transmit msg4, UE receives competition after L2 MAC layer receives msg3
Solve after mark, base station is considered as contention resolved and succeeded, and RRC connections are then set up to signaling as an ordinary signaling by L3
It is handed down to UE.Which simplify the flow that msg4 is issued, RRC connections are set up signaling and no longer limited by contention resolved timer,
The disposal ability requirement to L3 is reduced, the rate of being successfully accessed is improved.
Methods described is only applicable initial random access scene.
Contention resolved mark and RRC connections are set up only to send in signaling separately send, i.e. msg4 in methods described and competed
Solve mark.
The contention resolved sent in methods described in msg4 is designated what is carried in the msg3 that base station is received.
Contention resolved in methods described msg4 is identified by MAC CE transmissions.
Contention resolved mark in methods described in msg4 is that MAC is received and solved after msg3, and contention resolved mark connects
Receive and send without L3.
In methods described base station send msg4 to after UE, it is necessary to wait UE to be properly received after msg4 and feeding back ACK under ability meeting
Signaling is set up in hair RRC connections.
After base station sends msg4 to UE in methods described, if UE be not properly received that msg4 or MAC receives for NACK,
Base station can be retransmitted to msg4, if msg4 reaches maximum retransmission, UE is still not properly received msg4, msg4 to be waited
After timer expiry, the failure of this UE contention resolved, it is necessary to initiate Stochastic accessing again.
RRC connections, which set up signaling and receive the RRC connections carried in msg3 for L3, in methods described sets up after demand signalling production
Raw, this signaling is sent to RLC by L3, is sent to PHY by MAC scheduling, is sent after PHY modulation.
If UE is not properly received RRC connections and sets up signaling in methods described, UE can report NACK to base station, and MAC layer can be right
This signaling is retransmitted, until reaching maximum retransmission, and UE is not properly received also, then UE will not send RRC connections and set up
Into signaling to base station.When base station side L3 does not receive the signaling before completion timing device time-out is set up in RRC connections, then it can issue
RCC connection release messages, UE needs to initiate Stochastic accessing again.
Referring to Fig. 1, the flow of the embodiment of the present invention is as follows：
Step 1, UE initiate Stochastic accessing msg1 to base station；
Step 2, base station are received after msg1, are msg3 distribution ascending resources, and send msg2；
Step 3, UE are received after msg2, and sending carrying contention resolved mark and RRC connections in msg3, msg3 to base station asks
Signaling is sought, and starts contention resolved timer；
Step 4, base station side physical layer are correctly solved after msg3, by msg3 information reporting to MAC layer, MAC need to do with
Lower work：
1st, the contention resolved mark carried in msg3 is parsed；
2nd, request is set up into the RRC carried in msg3 connections and is sent to L3, L3 receives connection and set up after request, can be RRC
Connection sets up signaling and is sent to rlc layer, and rlc layer is sent to MAC layer；
3rd, to UE feeding back ACKs；
4th, msg4 is dispatched, the msg4 for carrying contention resolved mark is sent to UE.RRC connections are not carried in Msg4 and set up letter
Order.
If physical layer does not solve msg3 correctly, report that NACK, MAC can feed back NACK to UE to MAC, UE receives NACK
After will retransmit msg3；
Msg3 after being retransmitted such as UE is correctly solved, and performs step 4；
If msg3 reaches that maximum retransmission is not solved correctly also, return and perform step 1.
Step 5, UE receive msg4, if UE had correctly received before contention resolved timer expiry it is one's own
Msg4, then to base station feedback ACK, the success of UE contention resolveds；Otherwise do not feed back.If until contention resolved timer expiry also not just
Msg4 is really received, then contention resolved fails, perform step 1.
The UE has correctly received one's own msg4, that is, contention resolved mark and oneself msg3 in the msg4 received
Middle carrying it is identical.
The ACK/NACK of step 6, base station physical layer parsing msg4, and report MAC, if MAC receive for ACK, adjust
Signaling is set up in degree RRC connections, is sent to UE.
If in the step 6 base station end MAC layer receive for NACK, msg4 is retransmitted, until reaching msg4 maximum re-transmissions
Number of times or contention resolved timer expiry, then this time random access failure.
Step 7, UE receive RRC connections and set up signaling, are properly received, feed back to base station ack, UE is successfully accessed；Otherwise it is anti-
Present NACK.
If base station receives the NACK of UE feedbacks in the step 7, signaling is set up to RRC connections and retransmitted, Zhi Daoda
To maximum retransmission.If UE be not properly received also RRC connections foundation, UE will not send RRC connections set up completion signaling to
Base station.RCC Connection Releases can then be issued by not receiving the signaling before base station side L3 sets up completion timing device time-out in RRC connections
Message, UE needs to initiate Stochastic accessing again, then returns and re-execute step 1.
When it is implemented, those skilled in the art can voluntarily preset maximum retransmission and timer, using software engineering
Realize the automatic running of above flow.
Described above is the preferable case of the present invention, however it is not limited to present case, all within the spirit and principle of this example
Modification, replacement, improvement for being made etc., should be included within the protection domain of this patent.
Claims (10)
1. a kind of Stochastic accessing contention resolved implementation method for LTE, it is characterised in that：Contention resolved mark and RRC are connected
Connect and set up signaling separately send, be included in msg4 and only carry contention resolved mark and issued by L2, signaling work is set up in RRC connections
Issued for UE ordinary signaling by L3, implementation is as follows,
Msg4 is directly transmitted after L2 MAC layer receives msg3, L3 is not involved in msg4 transmission；
UE is received after contention resolved mark, and contention resolved success is thought in base station, and RRC connections are set up signaling as one by L3
Ordinary signaling is handed down to UE.
2. it is used for LTE Stochastic accessing contention resolved implementation method according to claim 1, it is characterised in that：For initial
Stochastic accessing scene.
3. it is used for LTE Stochastic accessing contention resolved implementation method according to claim 1, it is characterised in that：Sent out in msg4
The contention resolved sent is designated the contention resolved mark carried in the msg3 that base station is received.
4. it is used for LTE Stochastic accessing contention resolved implementation method according to claim 3, it is characterised in that：In msg4
Contention resolved mark is sent by MAC CE.
5. it is used for LTE Stochastic accessing contention resolved implementation method according to claim 4, it is characterised in that：Contention resolved
The reception and transmission of mark are without L3.
6. being used for LTE Stochastic accessing contention resolved implementation method according to claim 1 or 2 or 3 or 4 or 5, its feature exists
In：After base station sends msg4 to UE, wait UE to be properly received after msg4 and feeding back ACK and issue RRC connections and set up signaling.
7. it is used for LTE Stochastic accessing contention resolved implementation method according to claim 6, it is characterised in that：Base station is sent
After msg4 is to UE, if UE be not properly received that msg4 or MAC receives for NACK, base station is retransmitted to msg4.
8. it is used for LTE Stochastic accessing contention resolved implementation method according to claim 7, it is characterised in that：If msg4 reaches
To maximum retransmission, UE is still not properly received msg4, after msg4 timer expiries are waited, and this UE contention resolved loses
Lose, Stochastic accessing is initiated again.
9. being used for LTE Stochastic accessing contention resolved implementation method according to claim 1 or 2 or 3 or 4 or 5, its feature exists
In：RRC connections, which set up signaling and the RRC connections carried in msg3 are received by L3 set up after demand signalling, to be produced, and L3 sends out this signaling
RLC is given, PHY is sent to by MAC scheduling, is sent after PHY modulation.
10. it is used for LTE Stochastic accessing contention resolved implementation method according to claim 9, it is characterised in that：If UE does not have
It is properly received RRC connections and sets up signaling, UE reports NACK to base station, and MAC layer is retransmitted to this signaling；Until reaching maximum re-transmission
Number of times, UE is not properly received also, then UE will not send RRC connections and set up completion signaling to base station；If base station side L3 is in RRC connections
Do not receive the signaling before setting up completion timing device time-out, then can issue RCC connection release messages, UE need to initiate again with
Machine is accessed.
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| CN109756990A (en) * | 2017-11-06 | 2019-05-14 | 中国移动通信有限公司研究院 | A kind of accidental access method and mobile communication terminal |
| WO2020192482A1 (en) * | 2019-03-27 | 2020-10-01 | 华为技术有限公司 | Random access method and apparatus |
| CN112153749A (en) * | 2019-06-28 | 2020-12-29 | 中国电信股份有限公司 | Random access method, system, device and computer readable storage medium |
| WO2020259662A1 (en) * | 2019-06-28 | 2020-12-30 | 华为技术有限公司 | Method for random access and communication apparatus |
| CN114364055A (en) * | 2021-12-31 | 2022-04-15 | 京信网络系统股份有限公司 | Contention-based random access method, device, base station and storage medium |
| CN114630448A (en) * | 2017-08-10 | 2022-06-14 | 京瓷株式会社 | Communication control method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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Application publication date: 20170808 |