CN110430602B

CN110430602B - Relay switching method and device

Info

Publication number: CN110430602B
Application number: CN201810390109.9A
Authority: CN
Inventors: 魏立梅; 袁乃华; 范晨; 周志宏; 朱玉梅; 江森
Original assignee: Chengdu TD Tech Ltd
Current assignee: Chengdu TD Tech Ltd
Priority date: 2018-04-27
Filing date: 2018-04-27
Publication date: 2021-12-07
Anticipated expiration: 2038-04-27
Also published as: CN110430602A

Abstract

The invention provides a relay switching method and a device, wherein a first special signaling is sent to a mobile relay RN by source equipment, the mobile RN carries out co-frequency measurement and/or pilot frequency measurement on candidate cells according to the first special signaling, wherein the candidate cells comprise a first cell indicated by the first special signaling and/or a second cell which is not indicated by the first special signaling scanned by the mobile RN, the mobile RN sends a measurement result of a third cell meeting a measurement report condition to the source equipment, the source equipment determines a target cell in the third cell according to the measurement result and sends the third special signaling to target equipment corresponding to the target cell, and after receiving a fourth special signaling sent by the target equipment, the source equipment sends a second special signaling to the mobile RN according to the fourth special signaling to realize the switching of the mobile RN to the target cell. By the method, the mobile RN can be quickly switched to the target cell with the best quality, and the reasonable distribution of resources is realized.

Description

Relay switching method and device

Technical Field

The embodiment of the invention relates to the technical field of mobile communication, in particular to a relay switching method and a relay switching device.

Background

In order to extend coverage, the 3GPP protocol employs a Relay technology in an E-UTRAN (Evolved Universal Terrestrial Radio Access Network) system, and defines an RN (Relay Node) and a DeNB (donor eNB), where the DeNB refers to an eNB supporting a down-hanging RN, fig. 1 is a schematic view of an application scenario of the existing Relay technology, and as shown in fig. 1, an MME (mobile Management Entity) and an S-GW (Serving Gateway) are Network elements in an EPC (Evolved Packet Core). The RN accesses the cell of the DeNB, and the RN and the DeNB perform information interaction through a Un interface. The Un interface is a radio interface with two logical interfaces: s1 and X2. The DeNB acts as an S1/X2 proxy of the RN and forwards S1/X2 information between related network elements of the RN and the EPC through a logical interface S1/X2 on the Un interface. On one hand, the DeNB forwards S1/X2 information from the RN to the EPC/other eNBs through a logical interface S1/X2, and on the other hand, the DeNB forwards S1/X2 information sent by the EPC/other eNBs to the RN through a logical interface S1/X2. And accessing the UE in the RN cell into the RN cell through a Uu interface. The RN receives uplink information of the UE through a Uu interface, transmits the uplink information to the DeNB through a logical interface S1 on the Uu interface, and the DeNB further transmits the uplink information to the EPC. The EPC sends downlink information of the UE to the DeNB, the DeNB transmits the information to the RN through a logic interface S1 on a Un interface, and the RN transmits the information to the UE through a Uu interface.

In the relay network, a Link between the UE In the RN cell and the RN is referred to as an Access Link (Access Link), a Link between the RN and the corresponding base station DeNB is referred to as a Backhaul Link (Backhaul Link), and if the Backhaul Link and the Access Link operate on the same frequency spectrum, such a relay is referred to as an In-band relay (In-band RN). In order to avoid interference between the receiving end and the transmitting end of the inband relay, the backhaul link and the access link of the inband relay cannot simultaneously carry out downlink or uplink transmission, and the transmission needs to be staggered in time. Therefore, the 3GPP protocol defines RN subframe configuration on the backhaul link: the RN transmits/receives information on the backhaul link on the UL/DL subframe designated in the RN subframe configuration. In the RN cell, the RN configures DL subframes used on the backhaul link as MBSFN subframes so that UEs in the RN cell do not perform measurement in these subframes. An uplink subframe or a downlink subframe used by the RN when receiving uplink information from the UE or sending downlink information to the UE at a Uu interface needs to avoid the uplink subframe or the downlink subframe used by the RN and the DeNB during communication on a backhaul link.

Currently, the 3GPP protocol supports only one-stage (hop) in-band relay, does not support multi-stage (hop) in-band relay, and does not support multi-stage (hop) out-of-band relay or multi-stage (hop) hybrid relay. Meanwhile, the 3GPP protocol does not support the handover of the RN between cells, i.e. does not support the mobility requirement of the RN.

Disclosure of Invention

The invention provides a relay switching method and a relay switching device, which are used for realizing the quick switching of a mobile relay RN to a target cell with the best quality.

A first aspect of the present invention provides a relay switching method, including:

a mobile Relay (RN) receives a first special signaling sent by source equipment, wherein the first special signaling is used for indicating the mobile RN to carry out co-frequency measurement and/or inter-frequency measurement, and the source equipment is a source DeNB or a source DeRN;

the mobile RN performs co-frequency measurement and/or pilot frequency measurement on the candidate cell according to the first special signaling; the candidate cells comprise a first cell indicated by the first dedicated signaling and a second cell not indicated by the first dedicated signaling scanned by the mobile RN;

the mobile RN sends a measurement result of a third cell meeting a measurement reporting condition to the source equipment so that the source equipment determines a target cell in the third cell according to the measurement result; the measurement result comprises reference signal received power and reference signal received quality of the third cell;

and the mobile RN receives a second special signaling sent by the source equipment and switches to the target cell according to the second special signaling.

Optionally, the measurement result further includes at least one of an interference power of a downlink subframe corresponding to the third cell, an RN subframe configuration order list of the third cell, or an RN subframe configuration adopted by a surrounding cell of the mobile RN.

Optionally, the first dedicated signaling is specifically an RN reconfiguration message or an RRC connection reconfiguration message.

Optionally, the second dedicated signaling includes configuration information of non-contention random access, RN subframe configuration information, and other parameters used for Un interface communication.

A second aspect of the present invention provides a relay switching method, including:

a source device sends a first special signaling to a mobile Relay (RN), wherein the first special signaling is used for indicating the mobile RN to carry out co-frequency measurement and/or pilot frequency measurement on a candidate cell, and the source device is a source DeNB or a source DeRN; the candidate cells comprise a first cell indicated in the first dedicated signaling and/or a second cell not indicated in the first dedicated signaling scanned by the RN;

the source equipment receives a measurement result of a third cell which is sent by the mobile RN and meets the measurement reporting condition; the measurement result comprises reference signal received power and reference signal received quality of the third cell;

the source device determines a target cell in the third cell according to the measurement result, and sends a third dedicated signaling to a target device corresponding to the target cell; the target equipment is a target DeNB or a target DeRN; the third dedicated signaling comprises an RN subframe configuration request;

and the source equipment receives a fourth special signaling sent by the target equipment and sends a second special signaling to the mobile RN according to the fourth special signaling.

Optionally, the determining, by the source device, a target cell in the third cell according to the measurement result includes:

and the source equipment takes a cell which has the function of hanging the RN down and has the receiving quality meeting a preset condition in the third cell as a target cell according to the measuring result.

Optionally, the measurement result further includes at least one of an interference power of a downlink subframe corresponding to the third cell, an RN subframe configuration order list of the third cell, or an RN subframe configuration adopted by a surrounding cell of the mobile RN;

correspondingly, the third dedicated signaling includes at least one of an interference power of a downlink subframe corresponding to the target cell, an RN subframe configuration order list of the target cell, or an RN subframe configuration adopted by a peripheral cell of the target cell.

Optionally, the third dedicated signaling further includes GBR information and NON-GBR information for establishing a radio bearer between the source device and the mobile RN.

A third aspect of the present invention provides a relay apparatus comprising:

a receiving module, configured to receive a first dedicated signaling sent by a source device, where the first dedicated signaling is used to instruct a mobile RN to perform co-frequency measurement and/or inter-frequency measurement, and the source device is a source DeNB or a source denn;

the measurement module is used for carrying out co-frequency measurement and/or pilot frequency measurement on the candidate cell according to the first special signaling; the candidate cells comprise a first cell indicated by the first dedicated signaling and a second cell not indicated by the first dedicated signaling scanned by the mobile RN;

a sending module, configured to send a measurement result of a third cell that meets a measurement reporting condition to the source device, so that the source device determines a target cell in the third cell according to the measurement result; the measurement result comprises reference signal received power and reference signal received quality of the third cell;

the receiving module is configured to receive a second dedicated signaling sent by the source device;

and the switching module is used for switching to the target cell according to the second special signaling.

A fourth aspect of the present invention provides a relay apparatus comprising:

a memory;

a processor; and

a computer program;

wherein the computer program is stored in the memory and configured to be executed by the processor to implement the method of any of the first aspects.

A fifth aspect of the present invention provides a source device, comprising:

a sending module, configured to send a first dedicated signaling to a mobile relay RN, where the first dedicated signaling is used to instruct the mobile RN to perform intra-frequency measurement and/or inter-frequency measurement on a candidate cell; the candidate cells comprise a first cell indicated in the first dedicated signaling and/or a second cell not indicated in the first dedicated signaling scanned by the RN;

a receiving module, configured to receive a measurement result of a third cell that meets a measurement reporting condition and is sent by the mobile RN; the measurement result comprises reference signal received power and reference signal received quality of the third cell;

a determining module, configured to determine a target cell in the third cell according to the measurement result; the sending module is configured to send a third dedicated signaling to a target device corresponding to the target cell; the target equipment is a target DeNB or a target DeRN; the third dedicated signaling comprises an RN subframe configuration request;

the receiving module is configured to receive a fourth dedicated signaling sent by the target device;

and the sending module is configured to send a second dedicated signaling to the mobile RN according to the fourth dedicated signaling.

A sixth aspect of the present invention provides a source device comprising:

a memory;

a processor; and

a computer program;

wherein the computer program is stored in the memory and configured to be executed by the processor to implement the method of any of the second aspects.

The relay switching method and the relay switching device provided by the embodiment of the invention have the advantages that the first special signaling is sent to the mobile relay RN by the source device, the mobile RN performs co-frequency measurement and/or inter-frequency measurement on the candidate cells according to the first special signaling, wherein the candidate cells comprise the first cell indicated by the first special signaling and/or the second cell which is not indicated by the first special signaling scanned by the mobile RN, the mobile RN sends the measurement result of the third cell meeting the measurement report condition to the source device, the source device determines the target cell in the third cell according to the measurement result and sends the third special signaling to the target device corresponding to the target cell, and after receiving the fourth special signaling sent by the target device, the source device sends the second special signaling to the mobile RN according to the fourth special signaling, so that the mobile RN is switched to the target cell. By the method, the mobile RN can be quickly switched to the target cell with the best quality, and the reasonable distribution of resources is realized.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic view of an application scenario of a prior art relay technology;

fig. 2 is a schematic view of a scenario of relay networking according to an embodiment of the present invention;

fig. 3 is a flowchart illustrating a relay switching method according to an embodiment of the present invention;

fig. 4 is a first schematic structural diagram of a relay device according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a relay device according to an embodiment of the present invention;

fig. 6 is a first schematic structural diagram of a source device according to an embodiment of the present invention;

fig. 7 is a schematic structural diagram of a source device according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The terms "first," "second," "third," "fourth," and the like in the description and in the claims, as well as in the drawings, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein.

Fig. 2 is a schematic view of a relay networking scenario provided in the embodiment of the present invention, and as shown in fig. 2, the relay networking scenario provided in this embodiment is a multi-stage (hop) relay networking scenario.

The first-stage relay RN is connected with a DeNB (Doner eNB: donor eNB, eNB supporting the RN to be hung down) through a Un interface, and each subsequent-stage RN is connected with the previous-stage RN through the Un interface. And the UE in the coverage range of each level of RN accesses the level of RN through a Uu interface. The RN receives uplink information (including uplink service data and uplink control information) of the UE through the Uu interface, and forwards the uplink information to the RN or DeNB of the previous stage through the Un interface. Meanwhile, the RN receives downlink information (including downlink service data and downlink control information) of the UE from the RN or DeNB of the previous stage through the Un interface, and forwards the downlink information to the UE through the Uu interface.

The function of the Un interface between each level of RN and the RN at the previous level is completely the same as that of the Un interface between the first level of RN and the DeNB. There are two logical interfaces S1 and X2 on the Un interface, where the upper level RN proxies the S1 and X2 functions of the current level RN.

Among the RNs in each stage shown in fig. 2, the RN having the RN subordinate thereto is defined in the present invention as: DeNB (Doner RN: donor RN).

In a one-level (hop) or multi-level (hop) relay networking scenario, when an RN accesses a cell of a denn or DeNB, the denn or DeNB determines an RN subframe configuration used by a backhaul link, and sends the determined RN subframe configuration and other parameters for the RN to send and receive information in the backhaul link to the RN through an RN reconfiguration message. Other parameters for the RN to send and receive information in the backhaul link are related IEs included in the RN reconfiguration message in the 3GPP protocol TS 36.331, and are not described herein again. And after receiving the RN reconfiguration message, the RN saves all IEs in the RN reconfiguration message and sends an RN reconfiguration completion message to the DeRN or the DeNB. And then, the RN configures corresponding uplink subframes or downlink subframes in the RN subframes through the Un interface to send or receive information.

In order to support the mobility of the RN, the invention provides a switching method of the RN, which realizes that the mobile RN is quickly switched to a target cell with the best quality under the scene of one-stage or multi-stage relay networking and realizes reasonable distribution of resources. The following describes the relay handover method provided by the present invention in detail with reference to the accompanying drawings and the detailed description.

Fig. 3 is a flowchart illustrating a relay switching method according to an embodiment of the present invention, and as shown in fig. 3, the relay switching method specifically includes the following steps:

s301, the source equipment sends a first special signaling to the mobile relay RN;

the first dedicated signaling is used for instructing the mobile RN to perform intra-frequency measurement and/or inter-frequency measurement on the candidate cell. The source device mentioned in this embodiment is a source DeNB or a source DeRN without specific description.

It should be noted that, when the mobile RN accesses the cell of the source device before performing S301, the source device determines an RN subframe configuration and other related parameters for the accessed mobile RN, and sends the RN subframe configuration and other related parameters to the mobile RN through an RN reconfiguration message, and the mobile RN sends an RN reconfiguration complete message to the source device after receiving the RN reconfiguration message and completing the related configuration. After the source device receives the RN reconfiguration complete message, the source device further indicates the mobile RN to perform co-frequency measurement and/or inter-frequency measurement through the first dedicated signaling. In particular, the method comprises the following steps of,

the first dedicated signaling sent by the source device to the mobile RN for further indication is specifically a RN reconfiguration message or an RRC connection reconfiguration message. Correspondingly, after receiving the first dedicated signaling sent by the source device, the mobile RN feeds back a response message to the source device, where the response message is an RN reconfiguration complete message or an RRC connection reconfiguration complete message, and is used to indicate that the mobile RN completes the relevant configuration.

Optionally, the source device may send, at the same time as sending the RN reconfiguration message, a first dedicated signaling for instructing the mobile RN to perform intra-frequency measurement and/or inter-frequency measurement. That is, the source device may simultaneously carry configuration information of intra-frequency measurement and/or inter-frequency measurement in the RN reconfiguration message.

For the same-frequency measurement and the pilot frequency measurement, the source device may configure the same-frequency measurement for the mobile RN first, may configure the pilot frequency measurement for the mobile RN first, and may configure the same-frequency measurement and the pilot frequency measurement for the mobile RN at the same time. For different application scenarios, a person skilled in the art may specifically set a measurement sequence of the intra-frequency measurement and the inter-frequency measurement, which is not limited in this embodiment.

S302, the mobile RN performs co-frequency measurement and/or pilot frequency measurement on the candidate cell according to the first special signaling; the candidate cells comprise a first cell indicated by the first dedicated signaling and a second cell which is not indicated by the first dedicated signaling scanned by the mobile RN;

it should be noted that, according to the configuration information of the co-frequency measurement and/or the inter-frequency measurement in the first dedicated signaling, the mobile RN performs the co-frequency measurement and/or the inter-frequency measurement on the first cell indicated in the first dedicated signaling, and does not include the second cell not indicated in the first dedicated signaling.

Specifically, the first cell indicated by the first dedicated signaling is a cell established by the DeNB and the denn. The source device may know whether the surrounding cells are cells established by the DeNB and the denn according to the X2 interface message and the S1 interface message, and in order to support handover of the mobile RN, the source device may select the cells established by the DeNB and the denn from the surrounding cells as the first cell, so that the mobile RN can be handed over to the first cell. The source device instructs the mobile RN to measure the first cell through the first dedicated signaling.

Since there may be second cells established by RNs moved from other places around the mobile RN, these second cells may not be known by the source device, and specifically, the RNs corresponding to these cells may be a DeRN (i.e., having a function of hanging down an RN) or an RN without a function of hanging down an RN. Therefore, the mobile RN may also scan surrounding cells by itself, and when finding new cells (i.e., second cells) in the scanning process, the new cells do not belong to the first cell indicated in the first dedicated signaling sent by the source device, the mobile RN may also perform co-frequency measurement and/or inter-frequency measurement on the new cells (i.e., second cells) according to the co-frequency measurement and/or inter-frequency measurement configuration information in the measurement indication.

Specifically, the DeNB and the denn broadcast their own level (hop) number in the multi-level (hop) networking, unused uplink or downlink service rate level of the Un interface, and RN subframe configuration already adopted in the Un interface through system messages. For a new scanned cell, the mobile RN may determine, according to whether the broadcast message of the cell is received: whether the new cell is a cell established by the DeNB and the denn. Optionally, the mobile RN selects a cell established by the DeNB and the denn from the scanned cells as the second cell.

The same-frequency measurement is to measure the related measurement quantity of the candidate cell with the same frequency point as the source cell, and the different-frequency measurement is to measure the related measurement quantity of the candidate cell with different frequency point from the source cell. Specifically, the correlation measurement amount includes Reference Signal Receiving Power (RSRP) and Reference Signal Receiving Quality (RSRQ) of the cell.

Optionally, the mobile RN may determine, according to the type of the candidate cell, each downlink subframe corresponding to each RN subframe configuration that the candidate cell may adopt, and measure the interference power of the candidate cell in each downlink subframe. And determining the interference condition of each RN subframe configuration according to the interference power, and recording subscripts of the RN subframe configurations according to the sequence of interference from weak to strong to obtain an RN subframe configuration sequence list.

Optionally, if the device (DeNB or denn) corresponding to the surrounding cell of the mobile RN broadcasts, through the system message, the number of its own level (hops) in the multi-level (hop) networking, the unused uplink or downlink traffic rate level of the Un interface, and the RN subframe configuration already adopted at the Un interface, the mobile RN may acquire the above-mentioned related information broadcast in the system message by the surrounding cell of the mobile RN, so that the mobile RN acquires the RN subframe configuration adopted by the first cell and the second cell.

S303, the mobile RN sends a measurement result of the third cell meeting the measurement reporting condition to the source equipment;

as can be seen from the above description of S302, the mobile RN may measure the RSRP and RSRQ of each candidate cell, measure the interference power of each candidate cell in each downlink subframe, and record the RN subframe configuration sequence list of each candidate cell and the RN subframe configuration adopted by the surrounding cells of the mobile RN.

Optionally, RN subframes adopted by surrounding cells of the mobile RN are configured to be RN subframes adopted by a third cell that meets the measurement reporting condition.

For candidate cells with the same frequency point as the source cell, the mobile RN sends, to the source device, a measurement result of a third cell that meets a reporting condition of common-frequency measurement according to a preset reporting condition of common-frequency measurement, where the measurement result of the third cell includes, in addition to related measurement quantities (e.g., RSRP and RSRQ) of the common-frequency measurement, the method may further include: at least one of the interference power of a downlink subframe corresponding to the third cell, an RN subframe configuration sequence list of the third cell or RN subframe configuration adopted by surrounding cells of the mobile RN;

for candidate cells with different frequency points from the source cell, the mobile RN sends, according to a preset pilot frequency measurement reporting condition, a measurement result of a third cell that satisfies the pilot frequency measurement reporting condition to the source device, where the measurement result of the third cell includes, in addition to relevant measurement quantities (e.g., RSRP and RSRQ) of pilot frequency measurement, the method may further include: interference power of a downlink subframe corresponding to the third cell, an RN subframe configuration sequence list of the third cell or at least one of RN subframe configurations adopted by surrounding cells of the mobile RN.

Optionally, after the mobile RN determines the third cells to be reported according to the common-frequency measurement reporting condition and/or the pilot-frequency measurement reporting condition, a cell, of which the unused uplink or downlink service rate level of the Un interface can meet the Qos requirement of the corresponding radio bearer established by the Un interface of the current cell, may be further selected from the third cells as a final third cell, and a final measurement result of the third cell is reported to the source device.

S304, the source equipment determines a target cell in a third cell according to the measurement result;

the third cell in this embodiment is a candidate cell that satisfies the measurement reporting condition.

Specifically, if the third cell is the first cell indicated by the first dedicated signaling, the source device may acquire the first cell. The source device can know whether the eNB or RN corresponding to the third cell has the function of hanging down the RN according to the X2 interface message and the S1 interface message. Therefore, the source device determines a cell having the function of hanging down the RN and having a reception quality meeting a preset condition as a target cell in the third cell according to the X2 interface message, the S1 interface message and the measurement result sent by the mobile RN; the cell with the reception quality meeting the preset condition is a third cell with the best reception quality in the third cells with the function of hanging the RN.

Specifically, if the third cell is the second cell that is not indicated by the first dedicated signaling scanned by the mobile RN, that is, the source device cannot know whether the eNB or the RN corresponding to the third cell has the function of hanging down the RN according to the X2 interface message and the S1 interface message, therefore, the source device determines, as the target cell, a cell whose reception quality meets the preset condition in the third cell only according to the measurement result sent by the mobile RN, and the target device corresponding to the target cell may be the eNB, the RN, the DeNB, or the DeRN.

Specifically, if the third cell includes the first cell and the second cell, the source device determines, as the target cell, a cell whose reception quality meets a preset condition in the third cell according to a measurement result sent by the mobile RN. The target cell may be the first cell or the second cell. If the target cell is the first cell, the target device corresponding to the target cell is a DeNB or a DeRN; if the target cell is the second cell, the target device corresponding to the target cell may be an eNB, an RN, a DeNB, or a DeRN.

S305, the source device sends a third special signaling to the target device corresponding to the target cell;

the third dedicated signaling of this embodiment includes an RN subframe configuration request;

if the measurement result sent to the source device by the mobile RN includes the interference power of the downlink subframe corresponding to the third cell, the interference power of the downlink subframe corresponding to the target cell is carried in the third dedicated signaling;

if the measurement result sent to the source device by the mobile RN comprises an RN subframe configuration sequence list of a third cell, carrying the RN subframe configuration sequence list of the target cell in a third special signaling;

if the measurement result sent by the mobile RN to the source device includes the RN subframe configuration adopted by the surrounding cells of the mobile RN, the third dedicated signaling carries the RN subframe configuration adopted by the surrounding cells of the target cell.

Optionally, the third dedicated signaling further includes: GBR information and NON-GBR information of a radio bearer are established between a source device and a mobile RN, so that a target device can evaluate whether the target device has enough resource guarantee and QOS of the GBR bearer between the source device and the mobile RN according to the GBR information, and evaluate whether the target device has enough resource guarantee and minimum speed requirement of a NON-GBR bearer between the target device and the mobile RN according to the NON-GBR information.

It should be noted that, after the source device sends the third dedicated signaling to the target device corresponding to the target cell, when the target device determines that the handover target is the mobile RN according to the RN subframe configuration request in the third dedicated signaling, if the target device is a DeNB or a DeRN, S306 is executed;

and if the target equipment is eNB or RN, carrying a rejection indication to the source equipment through the special signaling. After receiving the rejection indication sent by the target device, the source device abandons the mobile RN to be handed over to the target cell corresponding to the target device, and executes S304 and S305 again.

If an X2 interface exists between the source device and the target device, the source device sends a third dedicated signaling to the target device through an X2 interface; and if the X2 interface does not exist between the source device and the target device, the source device sends a fifth dedicated signaling to the EPC through the S1 interface, and the EPC sends a sixth dedicated signaling to the target device after analyzing the fifth dedicated signaling.

It should be noted that the third dedicated signaling, the fifth dedicated signaling and the sixth dedicated signaling all carry all relevant parameters for the mobile RN to switch to the target device, and these parameters are used for the target device to perform admission control. In addition, the third dedicated signaling also carries: some parameters or identifications for X2 interface communications; the fifth dedicated signaling and the sixth dedicated signaling further carry: parameters for communication over the S1 interface.

S306, the target device sends a fourth special signaling to the source device;

specifically, before the target device (DeNB or DeRN) sends the fourth dedicated signaling to the source device, the following process is included:

the target equipment determines a downlink subframe and an uplink subframe suitable for communicating with the mobile RN according to the interference power of each downlink subframe corresponding to the target cell in a third special signaling sent by the source equipment and the interference power of each uplink subframe corresponding to the target cell measured by the target equipment;

the target equipment determines RN subframe configuration suitable for communicating with the mobile RN according to an RN subframe configuration sequence list of a target cell in a third special signaling sent by the source equipment and interference power of each uplink subframe corresponding to the target cell measured by the target equipment;

the target device determines a downlink subframe and an uplink subframe suitable for communicating with the mobile RN according to RN subframe configuration adopted by surrounding cells of the target cell in a third special signaling sent by the source device, and the target device excludes the downlink subframe and the uplink subframe corresponding to the RN subframe configuration adopted by the surrounding cells as much as possible; alternatively, the target device should avoid the RN subframe configuration adopted by the cells around the mobile RN as much as possible when determining the RN subframe configuration suitable for communication with the mobile RN.

For a multi-level networking scenario, it should be noted that, if the target device is a DeRN, the target DeRN does not have the capability of communicating with an upper-level DeRN or DeNB on the same subframe and simultaneously communicating with a lower-hanging RN:

the target DeRN excludes uplink subframes and downlink subframes corresponding to RN subframe configurations adopted when the target DeRN communicates with a previous DeRN or DeNB from downlink subframes and uplink subframes suitable for communicating with the mobile RN; and the RN subframe configuration adopted when the target DeRN and the previous DeRN or DeNB communicate is excluded from the RN subframe configuration suitable for communicating with the mobile RN.

And the target equipment allows the mobile RN to access based on the process, and then sends fourth special signaling to the source equipment, wherein the fourth special signaling comprises the configuration information of the non-contention random access, the RN subframe configuration information and other parameters for the Un interface communication.

If an X2 interface exists between the source device and the target device, the target device sends a fourth dedicated signaling to the source device through an X2 interface; and if the X2 interface does not exist between the source device and the target device, the target device sends a seventh dedicated signaling to the EPC through the S1 interface, and the EPC sends an eighth dedicated signaling to the source device after analyzing the seventh dedicated signaling.

It should be noted that the fourth dedicated signaling, the seventh dedicated signaling and the eighth dedicated signaling all carry all relevant parameters for the mobile RN to switch to the target device, and these parameters are used for the mobile RN to access the target device. In addition, the fourth dedicated signaling also carries: some parameters or identifications for X2 interface communications; the seventh dedicated signaling and the eighth dedicated signaling further carry: parameters for communication over the S1 interface.

S307, the source equipment sends a second special signaling to the mobile RN according to the fourth special signaling;

in this step, after receiving the fourth dedicated signaling sent by the target device, the source device generates a second dedicated signaling according to the parameter for switching the mobile RN in the fourth dedicated signaling, and sends the second dedicated signaling to the mobile RN.

Optionally, the sent second dedicated signaling is an RRC connection reconfiguration message, where the RRC connection reconfiguration message carries various configuration information used for the mobile RN to access the target cell, the selected RN subframe configuration, and other parameters used for Un interface communication.

S308, the mobile RN receives the second special signaling sent by the source equipment and switches to the target cell according to the second special signaling.

Specifically, the mobile RN initiates a non-contention random access process in the target cell according to the non-contention access configuration information in the second dedicated signaling, and obtains uplink synchronization with the target cell; the mobile RN determines an uplink subframe and a downlink subframe of Un interface communication according to RN subframe configuration information in the second special signaling; and the mobile RN receives the downlink information of the target equipment in the corresponding uplink subframe according to other parameters used for the Un interface communication in the second special signaling, and sends the uplink information to the target equipment in the corresponding uplink subframe.

After the mobile RN accesses the target cell, it needs to adjust a downlink subframe and an uplink subframe used in Uu interface communication in the mobile RN target cell according to RN subframe configuration information of the target cell. If the downlink subframe or the uplink subframe used for Uu interface communication in the target cell changes, the mobile RN needs to correspondingly adjust downlink or uplink configuration information of the affected UE.

When the mobile RN stops performing the relay function or there is no UE in the cell of the mobile RN, the mobile RN may release the bearer established on the Un interface, entering RRC _ IDLE from RRC _ CONNECTED.

Optionally, after S308, the mobile RN sends a response message to the source device. Optionally, the response message is an RRC connection reconfiguration complete message.

The relay switching method provided by the embodiment of the invention includes that a source device sends a first dedicated signaling to a mobile relay RN, the mobile RN performs co-frequency measurement and/or inter-frequency measurement on candidate cells according to the first dedicated signaling, wherein the candidate cells include a first cell indicated by the first dedicated signaling and/or a second cell which is not indicated by the first dedicated signaling scanned by the mobile RN, the mobile RN sends a measurement result of a third cell meeting a measurement report condition to the source device, the source device determines a target cell in the third cell according to the measurement result and sends the third dedicated signaling to a target device corresponding to the target cell, and after receiving a fourth dedicated signaling sent by the target device, the source device sends a second dedicated signaling to the mobile RN according to the fourth dedicated signaling to realize that the mobile RN is switched to the target cell. By the method, the mobile RN can be quickly switched to the target cell with the best quality, and the reasonable distribution of resources is realized.

Fig. 4 is a first schematic structural diagram of a relay device according to an embodiment of the present invention, and as shown in fig. 4, a relay device 40 according to this embodiment includes:

a receiving module 41, configured to receive a first dedicated signaling sent by a source device, where the first dedicated signaling is used to instruct a mobile RN to perform intra-frequency measurement and/or inter-frequency measurement, and the source device is a source DeNB or a source denn;

a measurement module 42, configured to perform intra-frequency measurement and/or inter-frequency measurement on the candidate cell according to the first dedicated signaling; the candidate cells comprise a first cell indicated by the first dedicated signaling and a second cell not indicated by the first dedicated signaling scanned by the mobile RN;

a sending module 43, configured to send a measurement result of a third cell that meets a measurement reporting condition to the source device, so that the source device determines a target cell in the third cell according to the measurement result; the measurement result comprises reference signal received power and reference signal received quality of the third cell;

the receiving module 41 is configured to receive a second dedicated signaling sent by the source device;

a switching module 44, configured to switch to the target cell according to the second dedicated signaling.

The relay device provided in this embodiment may execute the technical solution of the foregoing method embodiment, and the implementation principle and technical effect are similar, which are not described herein again.

Fig. 5 is a schematic structural diagram of a relay device according to an embodiment of the present invention, and as shown in fig. 5, a relay device 50 according to this embodiment includes:

a memory 51;

a processor 52; and

a computer program;

the computer program is stored in the memory 51 and configured to be executed by the processor 52 to implement the technical solution of moving RN in any one of the foregoing method embodiments, and the implementation principle and technical effect are similar, which are not described herein again.

Alternatively, the memory 51 may be separate or integrated with the processor 52.

When the memory 51 is a device independent of the processor 52, the relay device 50 may further include:

a bus 53 for connecting the memory 51 and the processor 52.

Fig. 6 is a first schematic structural diagram of a source device according to an embodiment of the present invention, and as shown in fig. 6, a source device 60 according to the embodiment includes:

a sending module 61, configured to send a first dedicated signaling to a mobile relay RN, where the first dedicated signaling is used to instruct the mobile RN to perform intra-frequency measurement and/or inter-frequency measurement on a candidate cell; the candidate cells comprise a first cell indicated in the first dedicated signaling and/or a second cell not indicated in the first dedicated signaling scanned by the RN;

a receiving module 62, configured to receive a measurement result of a third cell that meets a measurement report condition and is sent by the mobile RN; the measurement result comprises reference signal received power and reference signal received quality of the third cell;

a determining module 63, configured to determine a target cell in the third cell according to the measurement result; the sending module is configured to send a third dedicated signaling to a target device corresponding to the target cell; the target equipment is a target DeNB or a target DeRN; the third dedicated signaling comprises an RN subframe configuration request;

the receiving module 62 is configured to receive a fourth dedicated signaling sent by the target device;

the sending module 61 is configured to send a second dedicated signaling to the mobile RN according to a fourth dedicated signaling.

Optionally, the determining module 63 is specifically configured to, according to the measurement result, use a cell, which has an RN downlink function and whose reception quality meets a preset condition, in the third cell as a target cell.

Optionally, the fourth dedicated signaling includes configuration information of non-contention random access, RN subframe configuration information, and other parameters used for Un interface communication.

The source device provided in this embodiment may execute the technical solution of the above method embodiment, and the implementation principle and the technical effect are similar, which are not described herein again.

Fig. 7 is a schematic structural diagram of a source device according to an embodiment of the present invention, and as shown in fig. 7, a source device 70 according to this embodiment includes:

a memory 71;

a processor 72; and

a computer program;

the computer program is stored in the memory 71 and configured to be executed by the processor 72 to implement the technical solution of the source device in any one of the foregoing method embodiments, and the implementation principle and the technical effect are similar, which are not described herein again.

Alternatively, the memory 71 may be separate or integrated with the processor 72.

When the memory 71 is a device independent of the processor 72, the source device 70 may further include:

a bus 73 for connecting the memory 71 and the processor 72.

Those of ordinary skill in the art will understand that: all or a portion of the steps of implementing the above-described method embodiments may be performed by hardware associated with program instructions. The program may be stored in a computer-readable storage medium. When executed, the program performs steps comprising the method embodiments described above; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A relay switching method, comprising:

a mobile relay RN receives a first special signaling sent by source equipment, wherein the first special signaling is used for indicating the mobile RN to carry out co-frequency measurement and/or inter-frequency measurement, the source equipment is a source DeNB or a source DeRN, the DeNB is an eNB supporting the RN to be hung down, and the DeRN is the RN supporting the RN to be hung down;

the mobile RN performs co-frequency measurement and/or pilot frequency measurement on the candidate cell according to the first special signaling; the candidate cells comprise a first cell indicated by the first dedicated signaling and a second cell which is not indicated by the first dedicated signaling and scanned by the mobile RN, and the first cell is a cell established by a DeNB and a DeRN;

the mobile RN sends a measurement result of a third cell meeting a measurement reporting condition to the source equipment so that the source equipment determines a target cell in the third cell according to the measurement result; the measurement result comprises reference signal received power and reference signal received quality of a third cell, and the target cell is the third cell with the best received quality in the third cell with the function of hanging down the RN;

the mobile RN receives a second special signaling sent by the source equipment and switches to the target cell according to the second special signaling;

the measurement result further includes at least one of an interference power of a downlink subframe corresponding to the third cell, an RN subframe configuration order list of the third cell, or an RN subframe configuration adopted by a surrounding cell of the mobile RN.

2. The method according to claim 1, wherein the first dedicated signaling is specifically an RN reconfiguration message or an RRC connection reconfiguration message.

3. The method of claim 1, wherein the second dedicated signaling comprises configuration information for non-contention random access, RN subframe configuration information, and other parameters for Un interface communication.

4. A relay switching method, comprising:

a source device sends a first special signaling to a mobile Relay (RN), wherein the first special signaling is used for indicating the mobile RN to perform co-frequency measurement and/or inter-frequency measurement on a candidate cell, the source device is a source DeNB or a source DeRN, the DeNB is an eNB supporting the downlink RN, and the DeRN is the RN supporting the downlink RN; the candidate cells comprise a first cell indicated in the first dedicated signaling and a second cell which is not indicated in the first dedicated signaling and scanned by the RN, and the first cell is a cell established by the DeNB and the DeRN;

the source device determines a target cell in the third cell according to the measurement result, and sends a third dedicated signaling to a target device corresponding to the target cell; the target equipment is a target DeNB or a target DeRN; the third dedicated signaling comprises an RN subframe configuration request, and the target cell is a third cell with the best receiving quality in a third cell with an RN hanging function;

the source equipment receives a fourth special signaling sent by the target equipment and sends a second special signaling to the mobile RN according to the fourth special signaling;

5. The method of claim 4, wherein the source device determines a target cell in the third cell according to the measurement result, comprising:

6. The method of claim 4,

the third dedicated signaling comprises at least one of interference power of a downlink subframe corresponding to the target cell, an RN subframe configuration sequence list of the target cell, or RN subframe configuration adopted by surrounding cells of the target cell.

7. The method of claim 6, wherein the third dedicated signaling further comprises GBR information and NON-GBR information for establishing radio bearers between the source device and the mobile RN.

8. The method of claim 4, wherein the second dedicated signaling comprises configuration information of non-contention random access, RN subframe configuration information, and other parameters for Un interface communication.

9. A relay device, comprising:

a receiving module, configured to receive a first dedicated signaling sent by a source device, where the first dedicated signaling is used to instruct a mobile RN to perform co-frequency measurement and/or inter-frequency measurement, the source device is a source DeNB or a source denn, the DeNB is an eNB supporting a downlink RN, and the denn is an RN supporting the downlink RN;

the measurement module is used for carrying out co-frequency measurement and/or pilot frequency measurement on the candidate cell according to the first special signaling; the candidate cells comprise a first cell indicated by the first dedicated signaling and a second cell which is not indicated by the first dedicated signaling and scanned by the mobile RN, and the first cell is a cell established by a DeNB and a DeRN;

a sending module, configured to send a measurement result of a third cell that meets a measurement reporting condition to the source device, so that the source device determines a target cell in the third cell according to the measurement result; the measurement result comprises reference signal received power and reference signal received quality of a third cell, and the target cell is the third cell with the best received quality in the third cell with the function of hanging down the RN;

a switching module, configured to switch to the target cell according to the second dedicated signaling;

10. A relay device, comprising:

a memory;

a processor; and

a computer program;

wherein the computer program is stored in the memory and configured to be executed by the processor to implement the method of any one of claims 1-3.

11. A source device, comprising:

a sending module, configured to send a first dedicated signaling to a mobile relay RN, where the first dedicated signaling is used to instruct the mobile RN to perform intra-frequency measurement and/or inter-frequency measurement on a candidate cell; the candidate cells comprise a first cell indicated in the first dedicated signaling and a second cell which is not indicated in the first dedicated signaling and scanned by the RN, the first cell is a cell established by a DeNB and the DeRN, the DeNB is an eNB supporting the RN, and the DeRN is the RN supporting the RN;

a receiving module, configured to receive a measurement result of a third cell that meets a measurement reporting condition and is sent by the mobile RN; the measurement result includes reference signal received power and reference signal received quality of a third cell, and the measurement result further includes at least one of interference power of a downlink subframe corresponding to the third cell, an RN subframe configuration sequence list of the third cell, or RN subframe configuration adopted by surrounding cells of the mobile RN;

a determining module, configured to determine a target cell in the third cells according to the measurement result, where the target cell is a third cell with a best reception quality in the third cells with the function of hanging down the RN; the sending module is configured to send a third dedicated signaling to a target device corresponding to the target cell; the target equipment is a target DeNB or a target DeRN; the third dedicated signaling comprises an RN subframe configuration request;

12. A source device, comprising:

a memory;

a processor; and

a computer program;

wherein the computer program is stored in the memory and configured to be executed by the processor to implement the method of any one of claims 4-8.