CN102149150A

CN102149150A - Relay switching method and system

Info

Publication number: CN102149150A
Application number: CN2010101081173A
Authority: CN
Inventors: 孔永锋; 周杰
Original assignee: TD Tech Ltd
Current assignee: TD Tech Ltd
Priority date: 2010-02-05
Filing date: 2010-02-05
Publication date: 2011-08-10
Anticipated expiration: 2030-02-05
Also published as: CN102149150B

Abstract

The invention discloses a relay switching method and a system. The method comprises the steps as follows: during the relay switching process of UE (user equipment), a radio network controller RNC informs a source base station NodeB or a PDCP (packet data convergence protocol) in the RNC of stopping transmitting downlink data to the UE after receiving the radio link restore indication information of a target plot. The invention can be adopted to reduce the interference of the UE in the system and improve the communication quality.

Description

A kind of relay switching method and system

Technical field

The present invention relates to moving communicating field, relate in particular to a kind of relay switching method and system.

Background technology

In the TD-SCDMA system, a plurality of users communicate on same frequency or same time slot, any one user's signal all is to disturb concerning other user, therefore, the TD-SCDMA system is an interference-limited self-interference system, need control ascending power and the descending power of each user in this system, can meet design requirement with capacity and the performance that guarantees system.

At present, the scheme that the user is carried out power control is divided into open Loop Power control and closed power control.Open Loop Power control wherein is mainly used in subscriber equipment (UE) end and goes up in the random access procedure of initiating at uplink synchronous channel (UpPCH) or Physical Random Access Channel (PRACH).In case set up wireless connections (Radio Link) between base station (NodeB) and the radio network controller (RNC), then communicate by dedicated channel between UE, NodeB and the RNC, and the employing close-loop power controlling method is controlled uplink communication and downlink communication on this dedicated channel.

Closed power control is divided into exterior ring power control and inner loop power control again.Control ring between RNC and the NodeB is called exterior ring power control, and the control ring between NodeB and the UE is called inner loop power control.

Baton handover is the distinctive technology of TD-SCDMA system.In the baton handover process, UE sets up earlier and is connected with the up of Target cell, send upstream data to Target cell, and in this process, keep being connected with the descending of cell-of-origin, from the cell-of-origin downlink data receiving, set up descending the connection until UE with Target cell, stop again being connected with the descending of cell-of-origin from cell-of-origin downlink data receiving and disconnection.The detailed process of baton handover sees also Fig. 1.

Fig. 1 is the flow chart that the TD-SCDMA system carries out baton handover.

As shown in Figure 1, this flow process comprises:

Step 101, UE carries out measurement of correlation to this sub-district and adjacent sub-district, and the information of adjacent cells that satisfies switching condition is reported RNC, and carries out presynchronization with the adjacent sub-district of satisfying switching condition, adopts open Loop Power control in this presynchronization process.

Step 102, the information of adjacent cells in the measurement report that RNC reports according to UE carries out switch decision, determines Target cell, and admits control according to the priority of Target cell, and RNC sends Radio Link to the Target cell of admitting and sets up request.

After step 103, Target cell received that Radio Link is set up request message, configuration respective link resource sent Radio Link to RNC after configuration is finished and sets up response message.

Step 104 after RNC receives the response message of Target cell, sends downlink data on the one hand Target cell and cell-of-origin, passes through the descending connection of cell-of-origin on the other hand to UE transmitting channel reconfiguration message.

Step 105 after UE receives the channel reconfiguration message, adopts open Loop Power control mode and open loop synchronous control mode to launch upstream data to Target cell, and at the cell-of-origin downlink data receiving.

Step 106, to Target cell, UE sends the signaling of " channel is reshuffled and finished " to UE to RNC by Target cell at successful switch.

Step 107 after RNC receives the signaling of " channel is reshuffled and finished ", sends the order of " Radio Link removal request " to the cell-of-origin.

After step 108, cell-of-origin received the order of " Radio Link removal request ", the Radio Link of deletion and this UE sent " Radio Link deletion response " message to RNC.

Flow process when step 106～108 have provided the UE handover success, when the UE handoff failure, UE is by cell-of-origin notice RNC handoff failure, and the Radio Link with this UE is deleted in RNC notification target sub-district, and UE also communicates by letter on the cell-of-origin.

Before baton handover took place, NodeB controlled the transmitting power of UE by up inner loop power, and UE controls the down transmitting power of NodeB by descending inner loop power.

In the process of carrying out baton handover, because the up link of UE has been transferred to Target cell, therefore UE can't be by the down transmitting power of up link Controlling Source NodeB, and this moment, source NodeB sent downlink data according to the maximum transmission power that this NodeB supports to this UE.

As seen from the above technical solution, in the baton handover process of UE, because the control of the outer shroud of source NodeB is cut off, need source NodeB to send downlink data with maximum transmission power to this UE, this will produce bigger interference to other UE, influence communication quality.

Summary of the invention

In view of this, the purpose of the embodiment of the invention is to provide a kind of relay switching method and system, to reduce the interference to UE in the system, improves communication quality.

For achieving the above object, technical scheme of the present invention specifically is achieved in that

A kind of relay switching method, this method comprises:

In the baton handover process of UE, after radio network controller (RNC) received that the Radio Link of Target cell is rebuild indication Radio Link Restore Indication message, the PDCP Packet Data Convergence Protocol module PDCP among notification source base station node B or this RNC stopped to send downlink data to this UE.

A kind of baton handover system, this system comprises UE, RNC and NodeB;

In the baton handover process of UE, after RNC received that the Radio Link of Target cell is rebuild indication RadioLink Restore Indication message, the notification source base station node B stopped to send downlink data to this UE.

A kind of baton handover system, this system comprises UE and RNC;

In the baton handover process of UE, RNC notifies the PDCP among this RNC to stop to send downlink data to this UE after receiving that the Radio Link of Target cell is rebuild indication RadioLink Restore Indication message.

As seen, in the baton handover process of UE, after RNC receives the Radio Link RestoreIndication message of Target cell, notification source base station node B or PDCP stop to send downlink data to this UE, can avoid the transmitting power of source NodeB employing self maximum to send downlink data to this UE, thereby reduced interference, improved communication quality other UE in the system.

Description of drawings

Fig. 1 is the method flow diagram that network side provided by the invention is known end message.

Fig. 2 is relay switching method first pass figure provided by the invention.

Fig. 3 is relay switching method second flow chart provided by the invention.

Fig. 4 is relay switching method the 3rd flow chart provided by the invention.

Fig. 5 is the structural representation that adopts round-robin queue's mode buffer memory downlink data.

Fig. 6 is the structural representation that adopts two-way circular list mode buffer memory downlink data.

Fig. 7 is the flow chart of PDCP provided by the invention deal with data newspaper in the baton handover process.

Embodiment

For making purpose of the present invention, technical scheme and advantage clearer, below with reference to accompanying drawing, the embodiment that develops simultaneously, the present invention is described in more detail.

Relay switching method provided by the invention comprises: in the baton handover process of UE, after RNC receives that the Radio Link of Target cell is rebuild indication (Radio Link Restore Indication) message, (Packet Data ConvergenceProtocol PDCP) stops to send downlink data to this UE PDCP Packet Data Convergence Protocol module among notification source NodeB or this RNC.

When notification source NodeB stops when this UE sends downlink data,, therefore can cause downlink data to lose because source NodeB can this downlink data that stops to send of buffer memory.For the little business of downlink data amount, can adopt this mode, for example,, can stop to send downlink data by notification source NodeB to this UE for speech business.

PDCP in notifying this RNC stops when this UE sends downlink data, and PDCP can carry out buffer memory to described downlink data, after baton handover is finished, to the downlink data of UE transmission buffer memory, to avoid losing of downlink data.By PDCP buffer memory downlink data, and after baton handover is finished, issue data in buffer again, downlink data can be avoided losing, but certain time delay can be caused, therefore relatively be applicable to the big still business lower of downlink data amount, for example data service to delay requirement.

When notification source NodeB stops when this UE sends downlink data, if UE baton handover failure, RNC notification source NodeB recovers this UE is sent downlink data, particularly, RNC sends data reconstruction transmission link Restore Data Transfer message to source NodeB, after source NodeB receives Restore DataTransfer message, recover this UE is sent downlink data.Connect if the Radio Link of this UE is removed in UE baton handover success, cell-of-origin, this UE is sent downlink data by target NodeB.

PDCP in notifying this RNC stops when this UE sends downlink data, the PDCP of RNC in this RNC sends and stops data transmission PDCP_STOP message, after PDCP receives PDCP_STOP message, stop to send downlink data to described UE, and the described downlink data of buffer memory, RNC receive the physical channel of described UE reshuffle finish Physical Channel Reconfigration Complete message after, send the beginning data to PDCP and send PDCP_START message, after PDCP received PDCP_START message, beginning sent the downlink data of buffer memory to described UE.

Below in conjunction with accompanying drawing relay switching method of the present invention is described.

Fig. 2 is relay switching method first pass figure provided by the invention, and it shows by RNC notification source NodeB and stops to send downlink data to UE, and the flow process during the baton handover success.

Step 201, RNC decision carrying out baton handover, and beginning baton handover process, UE and target NodeB are carried out open loop Synchronization Control (open loop synchronization maintain).

Step 202, RNC sends Radio Link to target NodeB and sets up request (Radio Link setuprequest) message.

Step 203, target NodeB sends Radio Link to RNC and sets up response (Radio Link setupresponse) message.

Step 204, target NodeB and RNC set up Access Layer link application controls agreement (Access LinkControl Application Protocol, ALCAP) bearer context for data transmission (data transport bearer setup).

Step 205, RNC sends down-going synchronous (downlink synchronization) message to target NodeB.

Step 206, target NodeB sends uplink synchronous (uplink synchronization) message to RNC.

Step 207, RNC sends physical channel to UE and reshuffles (Physical channel reconfigration) message.

Step 208, target NodeB sends Radio Link to RNC and rebuilds indication (Radio Link RestoreIndication) message.

Step 209, RNC sends to source NodeB and stops transfer of data (stop datatranster) message.

Step 210, source NodeB sends Radio Link Failure indication (Radio Link FailureIndication) message to RNC.

Step 211, UE sends the physical channel reconstruction to RNC and finishes (Physical channelreconfiguration complete) message.

Step 212, RNC sends Radio Link removal request (Radio Link deletionrequest) message to source NodeB.

Step 213, source NodeB sends Radio Link deletion response (Radio Link deletionresponse) message to RNC, and the ALCAP bearer context for data transmission of source NodeB and RNC discharges.

Among Fig. 2, step 201～208 and 210～213 all are prior aries, and step 209 is parts that the present invention increases on the prior art basis.

Fig. 3 is relay switching method second flow chart provided by the invention, and it shows by RNC notification source NodeB and stops to send downlink data to UE, and the flow process during the baton handover failure.

Step 301～310 are with step 201～210.

Step 311, UE sends physical channel reconstruction failure (Physical channelreconfiguration failure) message to RNC.

Step 312, RNC sends to source NodeB and rebulids transfer of data (Restore Data Transfer) message.

Step 313, RNC sends the Radio Link deletion request message to target NodeB.

Step 314, target NodeB sends Radio Link deletion response message to RNC.

Among Fig. 3,

step

309 and 312 is parts that the present invention increases on prior art.

Fig. 4 is relay switching method the 3rd flow chart provided by the invention, and it shows by RNC notice PDCP and stops flow process when UE sends downlink data.

Step 401～408 are with step 201～208.

Step 409, the PDCP of RNC in this RNC sends and stops transfer of data (PDCP_STOP) message.

Step 410～411 are with step 210～211.

Step 412, the PDCP of RNC in this RNC sends beginning transfer of data (PDCP_START) message.

Step 413～414 are with step 212～213.

Among Fig. 4, step 409 and step 412 are parts that the present invention increases on the prior art basis.

Among Fig. 4, if physical channel reconstruction failure in the step 411 then still sends the message that begins transfer of data by the PDCP of RNC in this RNC in the step 412.

PDCP can adopt round-robin queue's mode or two-way circular list mode buffer memory downlink data.When adopting round-robin queue's mode buffer memory downlink data, PDCP keeps static storage in advance, and application dynamic memory space is used to store described downlink data, and the dynamic memory space pointer of described downlink data is stored in the described static storage.When adopting two-way circular list mode buffer memory downlink data, PDCP needs two parts dynamic memory space, be designated as the first dynamic memory space and the second dynamic memory space respectively, wherein, pointer in the described second dynamic memory space of stored, the first dynamic memory space is at the described downlink data of the second dynamic memory space stored.

PDCP only just applies for Dram when having downlink data to store, owing to do not need to take static memory, therefore can save memory space.

Among Fig. 5 first row grid is represented 16 memory nodes, can realize with the form of array, pointer of storage in each memory node in these 16 memory nodes, be used for storing the Dram address of a datagram correspondence, the memory node that the row of second among Fig. 5 grid is represented is exactly the memory space of this datagram.

Wherein, when needs storage datagram, just be this datagram application Dram only, otherwise do not take Dram, can save the Dram space.

As shown in Figure 5, a head pointer pHead and a tail pointer pEnd have been defined, head pointer points to head node, it is a oldest memory node of current use, tail pointer points to present node, i.e. last memory node of current use is not when having datagram to need buffer memory, pEnd and pHead hands coincide, the pointer in the present node are empty.

Among Fig. 5, currently have 10 nodes and store pointer, the memory cell of a datagram of each pointed, all the other 6 nodes storages be null pointer.

The difference of Fig. 6 and storage organization shown in Figure 5 is, be used among Fig. 5 to store that the memory node of pointer takies is static memory, be used among Fig. 6 to store that the memory node of pointer takies is Dram, only when having pointer to store, just apply for corresponding memory headroom, discharge corresponding space when not having the pointer storage.As seen Fig. 6 compares with Fig. 5, can save memory space further.

PDCP adopts the data cached process of mode of Fig. 5 or Fig. 6 to comprise: choose the next node of tail pointer pEnd, with datagram size application internal memory, datagram is copied in the internal memory of application, the pointer of this internal memory is articulated to the next node of pEnd.If application is less than internal memory, then the n from n node of head pointer indication node back wraps data, discharges this several node corresponding cache simultaneously, with mobile backward n the node of pHead, n＜m wherein, n can be provided with as required, usually value is 2, and m is the current node sum that takies.

As shown in Figure 7, this method comprises:

Step 701, PDCP receives datagram.

Step 702, PDCP need to judge whether the packed data newspaper, if, execution in step 703, otherwise execution in step 704.

Step 703 selects for use compression algorithm that datagram is compressed.

Step 704, PDCP adds the head processing of packing to datagram.

Step 705, PDCP need to judge whether the datagram of buffer memory packing, if, execution in step 706, otherwise execution in step 710.

Step 706, PDCP judges whether to apply for spatial cache, if, execution in step 707, otherwise execution in step 711.

Step 707 is stored current datagram.

Step 708 judges whether buffer memory is full, if, execution in step 709, otherwise return step 701.

Step 709 sends the oldest a few bag data to RLC, returns step 706.

According to relay switching method provided by the invention, the present invention also provides two kinds of baton handover systems.

First kind of baton handover system comprises UE, RNC and NodeB, in the baton handover process of UE, after RNC received that the Radio Link of Target cell is rebuild indication Radio Link Restore Indication message, the notification source base station node B stopped to send downlink data to this UE.

Second kind of baton handover system comprises UE and RNC, and in the baton handover process of UE, after RNC received that the Radio Link of Target cell is rebuild indication Radio Link Restore Indication message, the PDCP among the notice RNC stopped to send downlink data to this UE.

The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention, all any modifications of being made within the spirit and principles in the present invention, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims

1. a relay switching method is characterized in that, this method comprises:

2. method according to claim 1 is characterized in that, the PDCP among described notification source base station node B or this RNC stops to send downlink data to this UE and comprises:

When the current business of this UE was speech business, the notification source base station node B stopped to send downlink data to UE.

3. method according to claim 1 is characterized in that, the PDCP among described notification source base station node B or this RNC stops to send downlink data to this UE and comprises:

When the current business of this UE was data service, notice PDCP stopped to send downlink data to this UE, and the described downlink data of buffer memory.

4. method according to claim 2 is characterized in that,

If UE baton handover failure, RNC notification source NodeB recovers this UE is sent downlink data.

5. method according to claim 4 is characterized in that, RNC notification source NodeB recovers that this UE is sent downlink data and comprises:

RNC sends data reconstruction transmission link Restore Data Transfer message to source NodeB, after source NodeB receives Restore Data Transfer message, recovers this UE is sent downlink data.

6. method according to claim 2 is characterized in that,

Connect if the Radio Link of this UE is removed in UE baton handover success, cell-of-origin, this UE is sent downlink data by target NodeB.

7. method according to claim 3 is characterized in that, describedly notifies PDCP among this RNC to stop to send downlink data to this UE, and the described downlink data of buffer memory comprises:

RNC sends to PDCP and stops data transmission PDCP_STOP message, after PDCP receives PDCP_STOP message, stops to send downlink data to described UE, and the described downlink data of buffer memory;

RNC receive the physical channel of described UE reshuffle finish Physical Channel ReconfigrationComplete message after, send the beginning data to PDCP and send PDCP_START message, after PDCP received PDCP_START message, beginning sent the downlink data of buffer memory to described UE.

8. method according to claim 3 is characterized in that, the described downlink data of buffer memory comprises:

Keep static storage in advance;

Application dynamic memory space is used to store described downlink data;

The dynamic memory space pointer of described downlink data is stored in the described static storage.

9. method according to claim 3 is characterized in that, the described downlink data of buffer memory comprises::

Apply for the first dynamic memory space and the second dynamic memory space;

Pointer in the described second dynamic memory space of stored, the first dynamic memory space;

At the described downlink data of the second dynamic memory space stored.

10. a baton handover system is characterized in that, this system comprises UE, RNC and NodeB;

11. a baton handover system is characterized in that this system comprises UE and RNC;