CN101938795A - Switching method and system in wireless relay system - Google Patents
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Abstract
The invention discloses a switching method in a wireless relay system. In the method, DeNB is used as an MME, so that a source Relay and a destination Relay connected to the same DeNB exchange information through the DeNB, and the switching of UE between the source Relay and the destination Relay is implemented. The invention also discloses a switching system in the wireless relay system, which comprises a source Relay, a destination Relay and DeNB. The switching method and the switching system in the wireless relay system can ensure the UE switches between relays connected to the same DeNB.
Description
Technical field
The present invention relates to Long Term Evolution (LTE, Long Term Evolution) technology, relate in particular to changing method and system in a kind of wireless relay.
Background technology
The network architecture of LTE cellular radio communication system as shown in Figure 1, be based on Internet protocol (IP, Internet Protocol) flat architecture, comprise: the Universal Terrestrial Radio Access Network of evolution (E-UTRAN, Evolved Universal Terrestrial Radio Access Network), System Architecture Evolution core net (SAECN); Wherein, SAE CN comprises the SAE CN node of being made up of mobile management unit (MME, Mobility Management Entity), gateway (S-GW, Serving Gateway); E-UTRAN comprises E-UTRAN base station (eNB); MME is responsible for chain of command related works such as the processing, the contextual management of subscriber equipment (UE, User Equipment) of mobile management, Non-Access Stratum signaling; S-GW is responsible for transmission, forwarding and the route switching etc. of user face data; ENB is connected to SAE CN node by the S1 interface, is specially by the control plane S1-MME interface to link to each other with MME, links to each other with S-GW by the user plane S1-U interface, and S1 interface support eNB is connected with multiple spot between MME and the S-GW; ENB carries out the transmission of signaling and data by Uu interface and UE; Be connected to each other by X2 interface between the eNB,, guarantee user's seamless switching to support the mobility of UE in whole network.
After introducing relaying (Relay), the network architecture of LTE cellular radio communication system comprises as shown in Figure 2: Relay, eNB; Wherein, Relay has the function of passing through the Radio Link relay data between other network node, also may have the control information function; Radio Link between eNB and the UE is the link that direct transfers (direct link), comprises up (UL) direct link, descending (DL) direct link; Radio Link between Relay and the UE is access link (access link), comprises UL access link, DL access link; Radio Link between eNB and the Relay is back haul link (backhaul link), comprises UL backhaul link, DL backhaul link; Here, the eNB that is connected with Relay by backhaul link is called the eNB (DeNB, Donor eNB) that participates in relaying, and the eNB directly UE of service is called grand UE (Macro UE), and the UE of Relay service is relaying UE (Relay UE).
Being usually used in Relay in the LTE cellular radio communication system and the protocol stack scheme of DeNB is the ProxyS1/X2 scheme, as shown in Figure 3, on DeNB, increase a S1AP agency, this S1AP agency is transparent for MME and Relay, like this, from MME and S-GW side, UE directly connects DeNB, that is: MME and S-GW can't see the data relaying that passes through Relay between UE and DeNB; From Relay, the DeNB of increase is equivalent to MME and S-GW, and self and DeNB seem and the MME direct dialogue alternately.But also be not applicable to switching flow at present based on Proxy S1/X2 architectural schemes.
Summary of the invention
In view of this, main purpose of the present invention is to provide changing method and the system in a kind of wireless relay system, can realize UE with each relaying that same DeNB is connected between switching.
For achieving the above object, technical scheme of the present invention is achieved in that
Changing method in a kind of wireless relay system comprises:
Source Relay and target Relay are undertaken alternately UE being switched to target Relay by source Relay by DeNB.
Further, this method comprises that further source Relay determines target Relay, is specially:
Source Relay is according to being stored in the roaming restriction relevant information that is comprised in the UE context of self, and the configuration UE measurement parameter also sends to UE;
UE measures according to the UE measurement parameter that receives, and measurement result is generated measurement report and reports source Relay;
Source Relay determines to switch and definite target Relay according to the measurement report that wireless resource management information and the UE of UE reports; Determined target Relay and source Relay are connected same DeNB.
Further, described source Relay is undertaken alternately by DeNB with the target BS of determining, UE is switched to target Relay by source Relay be specially:
Source Relay initiate to switch to target Relay by DeNB, and after receiving replying that target Relay sends by DeNB, order UE inserts target Relay;
After UE inserted target Relay, target Relay request DeNB switched downlink path;
DeNB notification source Relay discharges resource, and downlink path is switched to target Relay by source Relay.
Further, described source Relay initiate to switch to target Relay by DeNB, and after receiving replying that target Relay sends by DeNB, order UE inserts target Relay and is specially:
Source Relay sends the handoff requirement message of carrying Target cell ID to DeNB;
The Target cell ID that DeNB carries according to the handoff requirement message that receives sends handoff request message to target Relay;
Target Relay receives described handoff request message, prepares to switch at the L1/L2 layer, and replys the DeNB handover request ack message;
After the handover request ack message that DeNB receives, send switching command to source Relay; Source Relay is forwarded to UE with the switching command that receives.
Further, described UE access target Relay is specially:
Source Relay is by the packet of DeNB in target Relay transmission service network state exchange order and source Relay buffering area;
UE obtains uplink resource allocation and Timing Advance to target Relay, carry out target Relay synchronously, and be linked into target Relay by access process at random.
The present invention also provides the switched system in a kind of wireless relay system, comprising:
Source Relay is used for sending signaling by DeNB to target Relay, receives and handle the signaling of being sent by DeNB;
Target Relay is used for sending signaling by DeNB to source Relay, receives and handle the signaling of being sent by DeNB;
DeNB is used for signaling that source Relay is sent or data forwarding to target Relay, and signaling that target Relay is sent or data forwarding realize UE is switched to target Relay by source Relay to source Relay.
Further, described source Relay comprises:
The signaling receiving and transmission module is used for sending signaling by DeNB to target Relay, receives and handle the signaling of being sent by DeNB;
Further, source Relay also comprises: target Relay determination module is used for determining target Relay.
Further, described target Relay determination module further comprises:
Parameter is provided with module, the information that the roaming restriction that is used for being comprised according to the UE context that is stored in self is correlated with, and the configuration UE measurement parameter also sends to UE;
Determination module is used to receive the measurement report that UE reports, and determines to switch and definite target Relay according to the wireless resource management information of measurement report that receives and UE; Wherein, described measurement report is generated according to the result that the UE measurement parameter that receives measures by UE; Determined target Relay and source Relay are connected same DeNB.
Further, described signaling receiving and transmission module further comprises:
Command module is used for initiate switching to target Relay by DeNB, and after receiving replying that target Relay sends by DeNB, order UE inserts target Relay;
The resource release module discharges resource after being used to receive the notice that DeNB sends.
Further, described target Relay further comprises:
Reply and command module, be used to reply the handoff request of source Relay, and after definite UE access, request DeNB switches downlink path.
Further, described DeNB further comprises:
Transceiver module is used for signaling that source Relay is sent or data forwarding to target Relay, and signaling that target Relay is sent or data forwarding are to source Relay;
Further, DeNB also comprises:
The path handover module, after being used to receive the request of switching downlink path, notification source Relay discharges resource, and downlink path is switched to target Relay by source Relay.
When Relay that LTE cellular radio communication system of the present invention adopts and the protocol stack of DeNB are ProxyS1/X2, DeNB is used as MME, make the source Relay and the purpose Relay that are connected same DeNB carry out information interaction by this DeNB, realize the switching of UE between this source Relay and purpose Relay, handoff procedure need not MME/S-GW and participates in, simplify switching flow, and reduced handover delay.
Description of drawings
Fig. 1 is the network architecture schematic diagram of LTE cellular radio communication system;
Fig. 2 is the network architecture schematic diagram of LTE cellular radio communication system behind the introducing Relay;
Fig. 3 is the protocol stack diagram of Proxy S1/X2 scheme;
Fig. 4 is the realization flow figure of the changing method in the embodiment of the invention wireless relay system;
Fig. 5 realizes that for adopting the present invention UE is at the flow chart that is connected the switching between each relaying of same DeNB.
Embodiment
The realization flow of the changing method in the embodiment of the invention wireless relay system may further comprise the steps as shown in Figure 4:
Step 401: source Relay determines target Relay;
Wherein, described definite target Relay is specially:
Step a1, source Relay are according to being stored in the relevant information of roaming restriction that is comprised in the UE context (UE context) of self, and the configuration UE measurement parameter also sends to UE; Be stored in the relevant information of roaming restriction among the UEcontext when wherein, the information that described roaming restriction is relevant is for connection foundation or last update tracing area (Tracking Area).
Step b1, UE measure according to the UE measurement parameter that receives, and measurement result is generated measurement report and reports source Relay; Wherein, describedly measurement result is generated measurement report be specially: measurement result according to rules such as system information, standards, is generated measurement report.
Step c1, source Relay determine to switch and definite target Relay according to the measurement report that RRM (RRM, Radio Resources Management) information and the UE of UE reports; Determined target Relay and source Relay are connected same DeNB.
Step 402: source Relay and the target Relay that determines are undertaken alternately user terminal UE being switched to target Relay by source Relay by giver eNB DeNB.
Wherein, described source Relay is undertaken alternately by DeNB with the target BS of determining, UE is switched to target Relay by source Relay be specially:
Step a2, source Relay initiate to switch to target Relay by DeNB, and after receiving replying that target Relay sends by DeNB, order UE inserts target Relay;
Wherein, initiate to switch, order access to be specially:
Step a21, source Relay send the handoff requirement message of carrying Target cell ID to DeNB;
The Target cell ID that step a22, DeNB carry according to the handoff requirement message that receives sends handoff request message to target Relay;
Step a23, target Relay receive described handoff request message, prepare to switch at the L1/L2 layer, and reply the DeNB handover request ack message;
After the handover request ack message that step a24, DeNB receive, send switching command to source Relay; Source Relay is forwarded to UE with the switching command that receives.
Step b2, UE insert target Relay, have promptly set up Packet data service between UE and target Relay, send switch acknowledgment message to target Relay; Target Relay request DeNB switches downlink path;
Wherein, described UE access target Relay is specially:
Step b21, source Relay are by the packet of DeNB in target Relay transmission service network state (SN Status) conversion command and source Relay buffering area;
Step b22, UE obtain uplink resource allocation and Timing Advance to target Relay, carry out target Relay synchronously, and be linked into target Relay by access process at random.
Step c2, DeNB notification source Relay discharge resource, and downlink path is switched to target Relay by source Relay, have promptly finished the foundation of Packet data service between MME and target Relay by DeNB, finish this switching flow.
Switched system in the embodiment of the invention wireless relay system comprises: source Relay, target Relay and DeNB; Wherein,
Source Relay is used for determining target Relay, sends signaling by DeNB to the target Relay that determines, receives and handle the signaling of being sent by DeNB;
Target Relay is used for sending signaling by DeNB to source Relay, receives and handle the signaling of being sent by DeNB;
DeNB is used for signaling that source Relay is sent or data forwarding to target Relay, and signaling that target Relay is sent or data forwarding are to source Relay, to realize that UE is switched to target Relay by source Relay.
Wherein, described source Relay comprises:
The signaling receiving and transmission module is used for sending signaling by DeNB to the target Relay that determines, receives and handle the signaling of being sent by DeNB;
Further, source Relay also comprises: target Relay determination module is used for determining target Relay.
Further, described target Relay determination module comprises: parameter is provided with module, determination module; Wherein,
Parameter is provided with module, the information that the roaming restriction that is used for being comprised according to the UE context that is stored in self is correlated with, and the configuration UE measurement parameter also sends to UE;
Determination module is used to receive the measurement report that UE reports, and determines to switch and definite target Relay according to the wireless resource management information of measurement report that receives and UE; Wherein, described measurement report is generated according to the result that the UE measurement parameter that receives measures by UE; Determined target Relay and source Relay are connected same DeNB.
Described signaling receiving and transmission module comprises: command module, resource release module; Wherein,
Command module is used for initiate switching to target Relay by DeNB, and after receiving replying that target Relay sends by DeNB, order UE inserts target Relay;
The resource release module discharges resource after being used to receive the notice that DeNB sends.
Wherein, described target Relay comprises:
Reply and command module, be used to reply the handoff request of source Relay, and after definite UE access, request DeNB switches downlink path.
Described DeNB comprises:
Transceiver module is used for signaling that source Relay is sent or data forwarding to target Relay, and signaling that target Relay is sent or data forwarding are to source Relay;
Further, DeNB also comprises:
The path handover module, after being used to receive the request of switching downlink path, notification source Relay discharges resource, and downlink path is switched to target Relay by source Relay.
When Relay that Fig. 5 adopts for the LTE cellular radio communication system and the protocol stack of DeNB are ProxyS1/X2, adopt the present invention to realize that UE is at the schematic flow sheet that is connected the switching between each relaying of same DeNB, by diagram as seen, by switching, the Packet data service of the Packet data service of UE and source Relay, source Relay and DeNB is converted to the Packet data service of UE and target Relay and the Packet data service of target Relay and DeNB; And the switching of UE between source Relay under the same DeNB and target Relay, do not influence the Packet data service of DeNB and MME and DeNB and S-GW, therefore, UE is under same DeNB during the switching between source Relay and target Relay, do not need to change the path of DeNB and MME, S-GW, be implemented as follows:
Step 1: source Relay is according to being stored in the relevant information of roaming restriction that is comprised among the UE context of self, and the configuration UE measurement parameter also sends to UE.
Step 2:UE measures according to the UE measurement parameter that receives, and with measurement result according to rules such as system information, standards, generate measurement report and also report source Relay.
Step 3: source Relay determines to switch and definite target Relay according to the measurement report that RRM information and the UE of UE reports.
Step 4: source Relay sends the handoff requirement message of carrying Target cell ID to DeNB; Determined target Relay and source Relay are connected same DeNB.
The Target cell ID that step 5:DeNB carries according to the handoff requirement message that receives sends handoff request message to target Relay, please carry out the switching preparation by target Relay; Wherein, described handoff request message is carried the UL/DL GTP-U address of source Relay.
Step 6: target Relay receives described handoff request message, prepares to switch at the L1/L2 layer, and replys the DeNB handover request ack message; Wherein, carry UL/DL GTP-U address, transparent vessel, C-RNTI and some other parameters of target Relay in the described handover request ack message, for example access parameter, system information block (System Information Block, the information that SIB) etc., also may comprise wireless network layer RNL/ transport network layer TNL.
After the handover request ack message that step 7:DeNB receives, send switching command to source Relay; Wherein, described switching command carries UL/DL GTP-U address, transparent vessel, C-RNTI and some other parameters of the target Relay that the handover request ack message that receives carries.
Step 8: source Relay is forwarded to UE with the switching command that receives;
The switching command that step 9:UE receives inserts target Relay, and sends switch acknowledgment message to target Relay, has promptly set up Packet data service between UE and target Relay; Wherein said switch acknowledgment message is carried the entrained C-RNTI of switching command that receives.
Step 10: after receiving described switch acknowledgment message, target Relay sends the downlink path handoff request to DeNB.
Path from MME/S-GW to DeNB does not change, and therefore, does not need to notify the MME/S-GW downlink path to change.
Step 11:DeNB notification source Relay discharges resource, and downlink path switched to target Relay by source Relay, send the path handoff response to target Relay, promptly finished the foundation of Packet data service between MME and target Relay, finish this switching flow by DeNB.
The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.
Claims (11)
1. the changing method in the wireless relay system is characterized in that, comprising:
Source relaying (Relay) is undertaken alternately by the eNB (DeNB) that participates in relaying with target Relay, and (UE) switches to target Relay by source Relay with user terminal.
2. method according to claim 1 is characterized in that, this method comprises that further source Relay determines target Relay, is specially:
Source Relay is according to being stored in the roaming restriction relevant information that is comprised in the UE context of self, and the configuration UE measurement parameter also sends to UE;
UE measures according to the UE measurement parameter that receives, and measurement result is generated measurement report and reports source Relay;
Source Relay determines to switch and definite target Relay according to the measurement report that wireless resource management information and the UE of UE reports; Determined target Relay and source Relay are connected same DeNB.
3. method according to claim 1 and 2 is characterized in that, described source Relay is undertaken alternately by DeNB with the target BS of determining, UE is switched to target Relay by source Relay be specially:
Source Relay initiate to switch to target Relay by DeNB, and after receiving replying that target Relay sends by DeNB, order UE inserts target Relay;
After UE inserted target Relay, target Relay request DeNB switched downlink path;
DeNB notification source Relay discharges resource, and downlink path is switched to target Relay by source Relay.
4. method according to claim 3 is characterized in that, described source Relay initiate to switch to target Relay by DeNB, and after receiving replying that target Relay sends by DeNB, order UE inserts target Relay and is specially:
Source Relay sends the handoff requirement message of carrying Target cell ID to DeNB;
The Target cell ID that DeNB carries according to the handoff requirement message that receives sends handoff request message to target Relay;
Target Relay receives described handoff request message, prepares to switch at the L1/L2 layer, and replys the DeNB handover request ack message;
After the handover request ack message that DeNB receives, send switching command to source Relay; Source Relay is forwarded to UE with the switching command that receives.
5. method according to claim 3 is characterized in that, described UE inserts target Relay and is specially:
Source Relay is by the packet of DeNB in target Relay transmission service network state exchange order and source Relay buffering area;
UE obtains uplink resource allocation and Timing Advance to target Relay, carry out target Relay synchronously, and be linked into target Relay by access process at random.
6. the switched system in the wireless relay system is characterized in that, comprising:
Source Relay is used for sending signaling by DeNB to target Relay, receives and handle the signaling of being sent by DeNB;
Target Relay is used for sending signaling by DeNB to source Relay, receives and handle the signaling of being sent by DeNB;
DeNB is used for signaling that source Relay is sent or data forwarding to target Relay, and signaling that target Relay is sent or data forwarding realize UE is switched to target Relay by source Relay to source Relay.
7. system according to claim 6 is characterized in that, described source Relay comprises:
The signaling receiving and transmission module is used for sending signaling by DeNB to target Relay, receives and handle the signaling of being sent by DeNB;
Further, source Relay also comprises: target Relay determination module is used for determining target Relay.
8. system according to claim 7 is characterized in that, described target Relay determination module further comprises:
Parameter is provided with module, the information that the roaming restriction that is used for being comprised according to the UE context that is stored in self is correlated with, and the configuration UE measurement parameter also sends to UE;
Determination module is used to receive the measurement report that UE reports, and determines to switch and definite target Relay according to the wireless resource management information of measurement report that receives and UE; Wherein, described measurement report is generated according to the result that the UE measurement parameter that receives measures by UE; Determined target Relay and source Relay are connected same DeNB.
9. system according to claim 7 is characterized in that, described signaling receiving and transmission module further comprises:
Command module is used for initiate switching to target Relay by DeNB, and after receiving replying that target Relay sends by DeNB, order UE inserts target Relay;
The resource release module discharges resource after being used to receive the notice that DeNB sends.
10. according to each described system of claim 6 to 9, it is characterized in that described target Relay further comprises:
Reply and command module, be used to reply the handoff request of source Relay, and after definite UE access, request DeNB switches downlink path.
11. system according to claim 10 is characterized in that, described DeNB further comprises:
Transceiver module is used for signaling that source Relay is sent or data forwarding to target Relay, and signaling that target Relay is sent or data forwarding are to source Relay;
Further, DeNB also comprises:
The path handover module, after being used to receive the request of switching downlink path, notification source Relay discharges resource, and downlink path is switched to target Relay by source Relay.
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| CN2009100885019A CN101938795A (en) | 2009-07-03 | 2009-07-03 | Switching method and system in wireless relay system |
| PCT/CN2009/075742 WO2011000192A1 (en) | 2009-07-03 | 2009-12-18 | Switching method and system in wireless relay system |
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