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) technologies, and in particular, to a method and a system for handover in a wireless relay.
Background
As shown in fig. 1, a network architecture of an LTE cellular wireless communication system is a flat architecture based on Internet Protocol (IP), and includes: an Evolved Universal Terrestrial Radio Access Network (E-UTRAN) and a System Architecture Evolution Core Network (SAECN); the SAE CN comprises an SAE CN node consisting of a Mobility Management Entity (MME) and a Serving Gateway (S-GW); the E-UTRAN includes E-UTRAN base stations (eNBs); the MME is responsible for control plane related work such as mobility management, processing of non-access stratum signaling, management of User Equipment (UE) context and the like; the S-GW is responsible for the transmission, forwarding, route switching and the like of user plane data; the eNB is connected to the SAE CN node through an S1 interface, specifically, the eNB is connected with the MME through a control plane S1-MME interface and connected with the S-GW through a user plane S1-U interface, and the S1 interface supports multipoint connection between the eNB and the MME as well as the S-GW; the eNB transmits signaling and data with the UE through a Uu interface; the eNBs are connected with each other through an X2 interface to support the mobility of the UE in the whole network and ensure the seamless switching of users.
After introducing Relay (Relay), a network architecture of the LTE cellular wireless communication system is shown in fig. 2, and includes: relay, eNB; among them, Relay has the function of relaying data between other network nodes through wireless link, and may also have the function of control information; the wireless link between the eNB and the UE is a direct link (direct link) and comprises an Uplink (UL) direct link and a Downlink (DL) direct link; the wireless link between the Relay and the UE is an access link (access link) which comprises a UL access link and a DL access link; the wireless link between the eNB and the Relay is a backhaul link (backhaul link) including a UL backhaul link and a DL backhaul link; here, an eNB connected to a Relay through a backhaul link is referred to as a Relay-participating eNB (DeNB, Donor eNB), a UE directly served by the eNB is referred to as a macro UE (macro UE), and a UE served by the Relay is referred to as a Relay UE (Relay UE).
The protocol stack scheme of the Relay and DeNB more commonly used in the LTE cellular wireless communication system is the ProxyS S1/X2 scheme, as shown in fig. 3, an S1AP proxy is added to the DeNB, the S1AP proxy is transparent to both the MME and the Relay, so that the UE appears to be directly connected to the DeNB from the MME and S-GW sides, that is: the MME and the S-GW cannot see the data Relay between the UE and the DeNB through the Relay; from Relay, the added DeNB is equivalent to the MME and the S-GW, and the interaction with the DeNB itself appears to be a direct dialogue with the MME. However, no switching process based on the Proxy S1/X2 architecture scheme exists at present.
Disclosure of Invention
In view of the above, the present invention is directed to a handover method and system in a wireless relay system, which can implement handover between UEs connected to the same DeNB.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a handover method in a wireless relay system, comprising:
and interacting the source Relay and the target Relay through the DeNB, and switching the UE from the source Relay to the target Relay.
Further, the method further comprises the step that the source Relay determines a target Relay, and specifically comprises the following steps:
the source Relay configures UE measurement parameters according to roaming restriction related information contained in the UE context stored in the source Relay and sends the UE measurement parameters to the UE;
the UE measures according to the received UE measurement parameters, generates a measurement report according to the measurement result and reports the measurement report to the source Relay;
the source Relay determines to switch and determines a target Relay according to the wireless resource management information of the UE and the measurement report reported by the UE; the determined target Relay is connected to the same DeNB as the source Relay.
Further, the interacting between the source Relay and the determined target base station through the DeNB, and the switching the UE from the source Relay to the target Relay specifically includes:
the source Relay initiates switching to the target Relay through the DeNB, and commands the UE to access the target Relay after receiving a response sent by the target Relay through the DeNB;
after the UE accesses a target Relay, the target Relay requests the DeNB to switch a downlink path;
and the DeNB informs the source Relay to release resources and switches the downlink path from the source Relay to the target Relay.
Further, the source Relay initiates handover to the target Relay through the DeNB, and after receiving a response sent by the target Relay through the DeNB, the method for instructing the UE to access the target Relay specifically includes:
a source Relay sends a switching demand message carrying a target cell ID to a DeNB;
the DeNB sends a switching request message to a target Relay according to a target cell ID carried by the received switching demand message;
the target Relay receives the switching request message, prepares switching at the L1/L2 layer and responds to a DeNB switching request response message;
after receiving the switching request response message, the DeNB sends a switching command to the source Relay; the source Relay forwards the received handover command to the UE.
Further, the UE accessing the target Relay specifically includes:
the source Relay sends a service network state transition command and a data packet in a source Relay buffer to the target Relay through the DeNB;
the UE acquires uplink resource allocation and timing advance from a target Relay, executes synchronization to the target Relay, and accesses to the target Relay through a random access process.
The present invention also provides a handover system in a wireless relay system, including:
the source Relay is used for sending signaling to the target Relay through the DeNB, and receiving and processing the signaling sent by the DeNB;
the target Relay is used for sending signaling to the source Relay through the DeNB, and receiving and processing the signaling sent by the DeNB;
and the DeNB is used for forwarding the signaling or the data sent by the source Relay to the target Relay, forwarding the signaling or the data sent by the target Relay to the source Relay, and realizing switching the UE from the source Relay to the target Relay.
Further, the source Relay includes:
the signaling transceiver module is used for sending a signaling to a target Relay through the DeNB, and receiving and processing the signaling sent by the DeNB;
further, the source Relay further includes: and the target Relay determining module is used for determining the target Relay.
Further, the target Relay determination module further includes:
the parameter setting module is used for configuring UE measurement parameters and sending the UE measurement parameters to the UE according to the information related to the roaming restriction contained in the UE context stored in the parameter setting module;
the determining module is used for receiving the measurement report reported by the UE, determining to switch and determining a target Relay according to the received measurement report and the radio resource management information of the UE; the UE generates the measurement report according to the result obtained by the measurement of the received UE measurement parameters; the determined target Relay is connected to the same DeNB as the source Relay.
Further, the signaling transceiver module further includes:
the command module is used for initiating switching to the target Relay through the DeNB and commanding the UE to access the target Relay after receiving a response sent by the target Relay through the DeNB;
and the resource releasing module is used for releasing the resources after receiving the notification sent by the DeNB.
Further, the target Relay further includes:
and the response and command module is used for responding the switching request of the source Relay and requesting the DeNB to switch the downlink path after the UE is determined to be accessed.
Further, the DeNB further includes:
the receiving and sending module is used for forwarding the signaling or the data sent by the source Relay to the target Relay and forwarding the signaling or the data sent by the target Relay to the source Relay;
further, the DeNB further includes:
and the path switching module is used for notifying the source Relay to release resources after receiving the request for switching the downlink path, and switching the downlink path from the source Relay to the target Relay.
When the protocol stacks of the Relay and the DeNB adopted by the LTE cellular wireless communication system are ProxyS1/X2, the DeNB is used as an MME, so that the source Relay and the target Relay connected to the same DeNB are subjected to information interaction through the DeNB, the switching of the UE between the source Relay and the target Relay is realized, no MME/S-GW is required to participate in the switching process, the switching process is simplified, and the switching time delay is reduced.
Drawings
Fig. 1 is a schematic diagram of a network architecture of an LTE cellular wireless communication system;
fig. 2 is a schematic diagram of a network architecture of an LTE cellular wireless communication system after the Relay is introduced;
FIG. 3 is a protocol stack diagram of the Proxy S1/X2 scheme;
fig. 4 is a flowchart illustrating an implementation of a handover method in a wireless relay system according to an embodiment of the present invention;
fig. 5 is a flowchart for implementing the handover of the UE between relays connected to the same DeNB by using the present invention.
Detailed Description
The implementation flow of the switching method in the wireless relay system of the embodiment of the invention is shown in fig. 4, and comprises the following steps:
step 401: determining a target Relay by a source Relay;
wherein, the determining the target Relay specifically comprises:
step a1, source Relay configures UE measurement parameter and sends it to UE according to the information related to roaming restriction contained in its own UE context; wherein the information related to roaming restriction is information related to roaming restriction stored in UEcontext when a connection is established or a Tracking Area (Tracking Area) is updated last time.
Step b1, the UE measures according to the received UE measurement parameters, generates a measurement report according to the measurement result and reports the measurement report to the source Relay; the generating of the measurement report from the measurement result specifically includes: and generating a measurement report according to the measurement result according to rules such as system information, specifications and the like.
Step c1, the source Relay determines to switch and determine the target Relay according to the Radio Resource Management (RRM) information of the UE and the measurement report reported by the UE; the determined target Relay is connected to the same DeNB as the source Relay.
Step 402: and the source Relay and the determined target Relay interact through the donor eNB DeNB, and the user terminal UE is switched from the source Relay to the target Relay.
The interacting between the source Relay and the determined target base station through the DeNB, and the switching of the UE from the source Relay to the target Relay specifically includes:
step a2, the source Relay initiates switching to the target Relay through the DeNB, and orders the UE to access the target Relay after receiving the response sent by the target Relay through the DeNB;
the initiating of the switching and the command access specifically comprises the following steps:
step a21, the source Relay sends a switching demand message carrying the ID of the target cell to the DeNB;
step a22, the DeNB sends a switching request message to a target Relay according to a target cell ID carried by the received switching demand message;
step a23, the target Relay receives the switching request message, prepares switching at the L1/L2 layer, and responds to the DeNB switching request response message;
step a24, after receiving the switching request response message, the DeNB sends a switching command to the source Relay; the source Relay forwards the received handover command to the UE.
Step b2, UE accesses target Relay, namely, a packet data service is established between UE and target Relay, and a switching confirmation message is sent to target Relay; a target Relay requests a DeNB to switch a downlink path;
wherein, the UE access target Relay specifically includes:
step b21, the source Relay sends a service network state (SN Status) conversion command and a data packet in a source Relay buffer to the target Relay through the DeNB;
step b22, UE obtains the uplink resource allocation and timing advance to the target Relay, executes the synchronization to the target Relay, and accesses to the target Relay through the random access flow.
Step c2, the DeNB informs the source Relay to release the resource, and switches the downlink path from the source Relay to the target Relay, i.e. the DeNB completes the establishment of the packet data service between the MME and the target Relay, and ends the switching process.
The switching system in the wireless relay system of the embodiment of the invention comprises: a source Relay, a target Relay and a DeNB; wherein,
the source Relay is used for determining a target Relay, sending a signaling to the determined target Relay through the DeNB, and receiving and processing the signaling sent by the DeNB;
the target Relay is used for sending signaling to the source Relay through the DeNB, and receiving and processing the signaling sent by the DeNB;
and the DeNB is used for forwarding the signaling or the data sent by the source Relay to the target Relay, and forwarding the signaling or the data sent by the target Relay to the source Relay so as to realize switching the UE from the source Relay to the target Relay.
Wherein the source Relay comprises:
the signaling transceiver module is used for sending signaling to the determined target Relay through the DeNB, and receiving and processing the signaling sent by the DeNB;
further, the source Relay further includes: and the target Relay determining module is used for determining the target Relay.
Further, the target Relay determination module includes: the device comprises a parameter setting module and a determining module; wherein,
the parameter setting module is used for configuring UE measurement parameters and sending the UE measurement parameters to the UE according to the information related to the roaming restriction contained in the UE context stored in the parameter setting module;
the determining module is used for receiving the measurement report reported by the UE, determining to switch and determining a target Relay according to the received measurement report and the radio resource management information of the UE; the UE generates the measurement report according to the result obtained by the measurement of the received UE measurement parameters; the determined target Relay is connected to the same DeNB as the source Relay.
The signaling transceiving module comprises: the system comprises a command module and a resource release module; wherein,
the command module is used for initiating switching to the target Relay through the DeNB and commanding the UE to access the target Relay after receiving a response sent by the target Relay through the DeNB;
and the resource releasing module is used for releasing the resources after receiving the notification sent by the DeNB.
Wherein the target Relay comprises:
and the response and command module is used for responding the switching request of the source Relay and requesting the DeNB to switch the downlink path after the UE is determined to be accessed.
The DeNB comprises:
the receiving and sending module is used for forwarding the signaling or the data sent by the source Relay to the target Relay and forwarding the signaling or the data sent by the target Relay to the source Relay;
further, the DeNB further includes:
and the path switching module is used for notifying the source Relay to release resources after receiving the request for switching the downlink path, and switching the downlink path from the source Relay to the target Relay.
Fig. 5 is a schematic flow chart of switching between relays connected to the same DeNB by using the present invention when protocol stacks of Relay and DeNB adopted by the LTE cellular wireless communication system are ProxyS s1/X2, and it can be seen from the diagram that by switching, packet data services of UE and source Relay, packet data services of source Relay and DeNB are converted into packet data services of UE and target Relay, and packet data services of target Relay and DeNB; and the switching of the UE between the source Relay and the target Relay under the same DeNB does not affect the packet data services of the DeNB and the MME, and the DeNB and the S-GW, so that the UE does not need to change the paths of the DeNB, the MME and the S-GW when switching between the source Relay and the target Relay under the same DeNB, and the specific implementation is as follows:
step 1: and the source Relay configures the UE measurement parameters according to the information related to the roaming restriction contained in the UE context stored in the source Relay and sends the UE measurement parameters to the UE.
Step 2: and the UE carries out measurement according to the received UE measurement parameters, and generates a measurement report according to rules of system information, specifications and the like of the measurement result and reports the measurement report to the source Relay.
And step 3: and the source Relay determines to switch and determine the target Relay according to the RRM information of the UE and the measurement report reported by the UE.
And 4, step 4: a source Relay sends a switching demand message carrying a target cell ID to a DeNB; the determined target Relay is connected to the same DeNB as the source Relay.
And 5: the DeNB sends a switching request message to a target Relay according to a target cell ID carried by the received switching demand message, and requests the target Relay to make a switching preparation; wherein, the switching request message carries the UL/DL GTP-U address of the source Relay.
Step 6: the target Relay receives the switching request message, prepares switching at the L1/L2 layer, and replies a DeNB switching request response message; the handover request response message carries the UL/DL GTP-U address, the transparent container, the C-RNTI, and some other parameters, such as access parameters, System Information Block (SIB), etc., of the target Relay, and may also include Information of the radio network layer RNL/transport network layer TNL.
And 7: after receiving the switching request response message, the DeNB sends a switching command to the source Relay; wherein, the handover command carries the UL/DL GTP-U address, the transparent container, the C-RNTI and other parameters of the target Relay carried by the received handover request response message.
And 8: the source Relay forwards the received switching command to the UE;
and step 9: the UE receives a switching command, accesses a target Relay, and sends a switching confirmation message to the target Relay, namely a packet data service is established between the UE and the target Relay; wherein the handover confirmation message carries the C-RNTI carried by the received handover command.
Step 10: and after receiving the switching confirmation message, the target Relay sends a downlink path switching request to the DeNB.
The path from the MME/S-GW to the DeNB does not change, and therefore, there is no need to notify the MME/S-GW of the downlink path change.
Step 11: and the DeNB informs the source Relay to release resources, switches the downlink path from the source Relay to the target Relay, and sends a path switching response to the target Relay, namely the establishment of the packet data service between the MME and the target Relay is completed through the DeNB, and the current switching process is ended.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.
Claims (11)
1. A handover method in a wireless relay system, comprising:
the source Relay (Relay) and the target Relay interact through the eNB (DeNB) participating in the Relay, and the user terminal (UE) is switched from the source Relay to the target Relay.
2. The method of claim 1, further comprising the source Relay determining a target Relay, specifically:
the source Relay configures UE measurement parameters according to roaming restriction related information contained in the UE context stored in the source Relay and sends the UE measurement parameters to the UE;
the UE measures according to the received UE measurement parameters, generates a measurement report according to the measurement result and reports the measurement report to the source Relay;
the source Relay determines to switch and determines a target Relay according to the wireless resource management information of the UE and the measurement report reported by the UE; the determined target Relay is connected to the same DeNB as the source Relay.
3. The method according to claim 1 or 2, wherein the source Relay interacts with the determined target base station through the DeNB, and the switching the UE from the source Relay to the target Relay specifically includes:
the source Relay initiates switching to the target Relay through the DeNB, and commands the UE to access the target Relay after receiving a response sent by the target Relay through the DeNB;
after the UE accesses a target Relay, the target Relay requests the DeNB to switch a downlink path;
and the DeNB informs the source Relay to release resources and switches the downlink path from the source Relay to the target Relay.
4. The method according to claim 3, wherein the source Relay initiates handover to the target Relay through the DeNB, and after receiving the response sent by the target Relay through the DeNB, instructing the UE to access the target Relay specifically includes:
a source Relay sends a switching demand message carrying a target cell ID to a DeNB;
the DeNB sends a switching request message to a target Relay according to a target cell ID carried by the received switching demand message;
the target Relay receives the switching request message, prepares switching at the L1/L2 layer and responds to a DeNB switching request response message;
after receiving the switching request response message, the DeNB sends a switching command to the source Relay; the source Relay forwards the received handover command to the UE.
5. The method of claim 3, wherein the accessing of the target Relay by the UE is specifically:
the source Relay sends a service network state transition command and a data packet in a source Relay buffer to the target Relay through the DeNB;
the UE acquires uplink resource allocation and timing advance from a target Relay, executes synchronization to the target Relay, and accesses to the target Relay through a random access process.
6. A handover system in a wireless relay system, comprising:
the source Relay is used for sending signaling to the target Relay through the DeNB, and receiving and processing the signaling sent by the DeNB;
the target Relay is used for sending signaling to the source Relay through the DeNB, and receiving and processing the signaling sent by the DeNB;
and the DeNB is used for forwarding the signaling or the data sent by the source Relay to the target Relay, forwarding the signaling or the data sent by the target Relay to the source Relay, and realizing switching the UE from the source Relay to the target Relay.
7. The system of claim 6, wherein the source Relay comprises:
the signaling transceiver module is used for sending a signaling to a target Relay through the DeNB, and receiving and processing the signaling sent by the DeNB;
further, the source Relay further includes: and the target Relay determining module is used for determining the target Relay.
8. The system of claim 7, wherein the target Relay determination module further comprises:
the parameter setting module is used for configuring UE measurement parameters and sending the UE measurement parameters to the UE according to the information related to the roaming restriction contained in the UE context stored in the parameter setting module;
the determining module is used for receiving the measurement report reported by the UE, determining to switch and determining a target Relay according to the received measurement report and the radio resource management information of the UE; the UE generates the measurement report according to the result obtained by the measurement of the received UE measurement parameters; the determined target Relay is connected to the same DeNB as the source Relay.
9. The system of claim 7, wherein the signaling transceiver module further comprises:
the command module is used for initiating switching to the target Relay through the DeNB and commanding the UE to access the target Relay after receiving a response sent by the target Relay through the DeNB;
and the resource releasing module is used for releasing the resources after receiving the notification sent by the DeNB.
10. The system of any of claims 6 to 9, wherein the target Relay further comprises:
and the response and command module is used for responding the switching request of the source Relay and requesting the DeNB to switch the downlink path after the UE is determined to be accessed.
11. The system of claim 10, wherein the DeNB further comprises:
the receiving and sending module is used for forwarding the signaling or the data sent by the source Relay to the target Relay and forwarding the signaling or the data sent by the target Relay to the source Relay;
further, the DeNB further includes:
and the path switching module is used for notifying the source Relay to release resources after receiving the request for switching the downlink path, and switching the downlink path from the source Relay to the target 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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