WO2012159534A1

WO2012159534A1 - Method and system for configuring structure of downlink backhaul subframe

Info

Publication number: WO2012159534A1
Application number: PCT/CN2012/075442
Authority: WO
Inventors: 梁枫
Original assignee: 中兴通讯股份有限公司
Priority date: 2011-05-26
Filing date: 2012-05-14
Publication date: 2012-11-29
Also published as: CN102801461A

Abstract

Disclosed are a method and a system for configuring a structure of a downlink backhaul subframe. The method comprises: configuring, according to a downlink propagation delay between a base station and a repeater station or a distance between the base station and the repeater station, an endpoint symbol of backhaul transmission on a second slot of a downlink backhaul subframe of the repeater station and/or a timing state of the repeater station; and the repeater station configuring a structure of the downlink backhaul subframe according to the endpoint symbol and/or the timing state. The present invention prevents self interference of a downlink receiving end and transmitting end of the repeater station, so as to guarantee the system performance and user experience.

Description

The present invention relates to the field of communications, and in particular to a method and system for configuring a downlink backhaul subframe structure. BACKGROUND OF THE INVENTION As an emerging technology, relay technology has attracted more and more attention and is regarded as a key technology of B3G/4G. As future wireless communications or cellular systems require increased coverage and support for higher rate transmissions, this presents new challenges for wireless communication technologies. At the same time, the cost of system construction and maintenance is more prominent. As the transmission rate and communication distance increase, the energy consumption problem of the battery becomes prominent, and the future wireless communication will adopt a higher frequency, thereby causing a more serious path loss attenuation. Through the relay technology, the traditional single-hop link can be divided into multiple multi-hop links. Due to the shortened distance, the path loss will be greatly reduced, which will improve the transmission quality and expand the communication range, thereby providing users with more Fast and better service. 1 is a schematic diagram of a structure of a relay network according to the related art. As shown in FIG. 1, in a relay network, a link between a user participating in a service of a relay station and a relay station is referred to as an access link (Access Link), and a relay station. The link between the base station and the base station is called a backhaul link. The link between the user participating in the service and the base station is called a direct link. 2 is a schematic diagram of a subframe structure according to the related art. As shown in FIG. 2, in a Long Term Evolution (LTE) and its subsequent evolved communication system, a standard of one downlink subframe or uplink subframe is used. The length of time is r _OT3⁄4/rame = 307207 = lms, each sub-frame contains 2 slots, and the length of each slot is r _sl . _t = 15360 - T _S = 0.5 ms. If a normal cyclic prefix (the cyclic prefix is referred to as CP) is used in a subframe, one downlink or uplink slot includes seven orthogonal frequency division multiplexing (OFDM) symbols or Single Carrier-Frequency Division Multiple Access (SC-FDMA) symbols, that is, from symbol 0 to symbol 6. The length of the symbol 0 is 2208T _S , and the length of other symbols is 2192T _S; if the extended cyclic prefix is used in the subframe, the 1 slot of the Bay U contains 6 symbols, and the length of the CP is Calculated, each symbol has a length of 2560 T _S . Where Ts represents the length of a time unit, T _s = 1 / 30720 milliseconds. In the description of the present invention, an OFDM symbol or an SC-FDMA symbol may be simply referred to as a symbol, and in a subframe, a symbol identifier starts from 0. The following discussion, unless otherwise stated, is assumed to be a normal CP configuration. For in-band relaying, the backhaul link and the access link operate on the same spectrum. In general, in order to avoid interference between the receiving end and the transmitting end of the relay station itself, for in-band relay, it is stipulated that downlink or uplink transmission cannot be performed simultaneously on the backhaul link and the access link, but must be staggered in time. . Therefore, the subframes used for relay station transmission are currently divided into a backhaul subframe and an access subframe, and the backhaul downlink and uplink transmissions of the relay station are performed on the downlink and uplink backhaul subframes, respectively, and the downlink and uplink access subframes are respectively performed. It is specifically used for the downlink and uplink transmission of the access link. Moreover, for the downlink backhaul subframe, the relay station needs to perform downlink transmission of the access link on the first or second OFDM symbols of the subframe, that is, downlink transmission to the user through the downlink access link, and on the remaining available resources. The downlink reception of the backhaul link is performed, that is, the downlink transmission from the base station is received through the downlink backhaul link. Moreover, between the downlink transmission and the downlink reception, the relay station needs a guard interval of a certain length of time for the radio frequency conversion, and the conversion process from the downlink transmission to the downlink reception or the downlink reception to the downlink transmission is difficult. Completed in the CP, and in order to ensure compatibility with LTE users, it is currently required to set the guard interval in the downlink backhaul subframe, and sacrifice some of the time slot resources in the downlink backhaul subframe to avoid the downlink transmitter and receiver of the relay station itself. Interference occurs. Currently, the configuration of the downlink backhaul subframe structure specifically includes two slot structure configurations in the subframe, that is, the start and end configurations of the downlink backhaul transmission in the slot. However, as described above, the guard interval occupies a part of the time slot resources in the downlink backhaul subframe. Therefore, the structure configuration of the downlink backhaul subframe is limited accordingly. The limits are different for different relay station timing states. Currently, the relay station has two timing states, a synchronous state and an asynchronous state. If the timing of the downlink transmission of the relay access link is aligned with the timing of the downlink transmission of the base station, the relay station is said to be in a synchronous state, otherwise it is in an asynchronous state. Specifically, for the relay station in the synchronous state, the downlink backhaul subframe configuration includes: In the first slot, the starting point of the downlink backhaul transmission is configured as symbol 1 or 2 or 3, and the destination is configured as symbol 6, in the second slot. The starting point of the downlink backhaul transmission is configured as symbol 0, and the end point is configured as symbol 5; for the relay station in the non-synchronized state, the structure configuration of the downlink backhaul subframe includes: in the first slot, the starting point of the downlink backhaul transmission is configured as symbol 2 or 3. The end point is configured as symbol 6. In the second slot, the starting point of the downlink backhaul transmission is configured as symbol 0, and the end point is configured as symbol 6. As shown in Table 1 and Table 2, the downlink backhaul transmission starting point of the first slot is regarded as the starting point of downlink transmission of the downlink backhaul subframe, and the base station performs configuration to the relay station through high layer signaling; the second slot The configuration of the structure strictly corresponds to the synchronous or asynchronous state in which the relay station is located, that is, the configuration 1 in Table 2 is used for the relay station in the synchronous state, and the configuration in the non-synchronized state is configured in Table 2, and the base station does not pass the high layer signaling. Configure to the relay station. Table 1 The first slot structure configuration in the downlink backhaul subframe

Table 2 The second slot structure configuration in the downlink backhaul subframe

3 is a schematic diagram of a structure of a downlink backhaul subframe in an asynchronous state according to the related art. As shown in FIG. 3, for a non-synchronized state relay station, in a first slot of a downlink backhaul subframe, a starting point of a downlink backhaul transmission is configured as a symbol 2 Or 3, the end point is configured as symbol 6. In the second slot, the starting point of the downlink backhaul transmission is configured as symbol 0, and the end point is configured as symbol 6. 4 is a schematic diagram of a synchronization state downlink backhaul subframe structure according to the related art. For a relay station in a synchronous state, a specific symbol that can be used for downlink backhaul transmission in a downlink backhaul subframe also has a propagation delay between the base station and the relay station. The change is different. When the propagation delay between the base station and the relay station exceeds a certain threshold value Γ _{Η 7Η} , the available symbols of the second slot in the downlink backhaul subframe are symbols 0 to 4, and the symbol 5 will not be available. In the related art, the end point symbol of the backhaul transmission of the relay station in the synchronization state on the second slot of the downlink backhaul subframe is fixedly configured as symbol 5, but when the distance between the base station and the relay station is long, or when the relay station moves, A relay station in a synchronous state is likely to generate very serious self-interference between the downstream receiving end and the transmitting end, resulting in transmission errors, which have a great influence on system performance and user experience. SUMMARY OF THE INVENTION Embodiments of the present invention provide a downlink backhaul subframe structure configuration method and system, so as to at least solve the related art, in the downlink backhaul subframe of the relay station, the end symbol of the backhaul transmission on the second slot is fixedly configured as symbol 5, so that When the distance between the base station and the relay station is long or when the relay station moves, the relay station will have a very serious self-interference problem between the downlink receiving end and the transmitting end. The embodiment of the invention provides a downlink backhaul subframe structure configuration method. The downlink backhaul subframe structure configuration method according to the embodiment of the present invention includes: according to a downlink propagation delay of the base station to the relay station or a distance between the base station and the relay station, the end point symbol of the backhaul transmission on the second slot of the downlink backhaul subframe of the relay station / or the timing state of the relay station is configured; the relay station configures the downlink backhaul subframe structure according to the end point symbol and/or the timing state. Configuring the end point symbol of the backhaul transmission on the second slot of the relay downlink backhaul subframe and/or the timing state of the relay station when the downlink propagation delay of the base station to the relay station is lower or lower than the preset first threshold One of the following is included: The configuration end point symbol is symbol 5 and/or the configuration timing status is the synchronization status; the configuration end point symbol is symbol 6 and/or the configuration timing status is asynchronous. When the downlink propagation delay of the base station to the relay station exceeds or does not fall below a preset second threshold, the end symbol of the backhaul transmission on the second slot of the relay downlink backhaul subframe and/or the timing state of the relay station are configured. One of the following is included: The configuration end point symbol is symbol 4 and/or the configuration timing status is the synchronization status; the configuration end point symbol is symbol 6 and/or the configuration timing status is non-synchronized. In the case that the distance between the base station and the relay station is lower or lower than a preset third threshold, configuring the end point symbol of the backhaul transmission on the second slot of the relay downlink backhaul subframe and/or the timing state of the relay station includes One of the following: Configure the end point symbol to be symbol 5 and/or configure the timing status to be in sync state; configure the end point symbol to symbol 6 and/or configure the timing status to be unsynchronized. In the case that the distance between the base station and the relay station exceeds or does not fall below a preset fourth threshold, configuring the end point symbol of the backhaul transmission on the second slot of the relay downlink backhaul subframe and/or the timing state of the relay station includes One of the following: Configure the end point symbol to be symbol 4 and/or configure the timing status to be in sync state; configure the end point symbol to symbol 6 and/or configure the timing status to be unsynchronized. The configuration of the end point symbol of the backhaul transmission and/or the timing status of the relay station on the second slot of the downlink backhaul subframe of the relay station includes: the end point symbol and/or the timing state of the backhaul transmission on the second slot of the downlink backhaul subframe of the relay station Configure it. The configuration of the end point symbol of the backhaul transmission and/or the timing status of the relay station on the second slot of the downlink backhaul subframe of the relay station includes: the base station to the end point symbol of the backhaul transmission on the second slot of the relay downlink backhaul subframe and/or the timing of the relay station The status is configured; the base station informs the relay station of the configuration result through high layer signaling and/or X2 interface signaling. The configuration of the end point symbol of the backhaul transmission and/or the timing status of the relay station on the second slot of the downlink backhaul subframe of the relay station includes: 0AM module to the end point symbol of the backhaul transmission on the second slot of the relay downlink backhaul subframe and/or the relay station The timing state is configured; the 0AM module informs the relay station of the configuration result through 0AM signaling. The OAM module notifies the relay station of the configuration result by using the OAM signaling. The OAM module notifies the base station of the configuration result by the OAM signaling; the base station informs the relay station by using the high layer signaling and/or the X2 interface signaling and/or the direct forwarding manner. After the relay station receives the configuration result, the method further includes: the relay station notifying the base station of the configuration result by using high layer signaling and/or X2 interface signaling and/or direct forwarding. The higher layer signaling and/or X2 interface signaling and/or OAM signaling comprises a first binary sequence, wherein the first binary sequence is used to indicate that the end point symbol is configured as symbol 4, symbol 5 or symbol 6. The higher layer signaling and/or X2 interface signaling and/or OAM signaling includes a second binary sequence, wherein the second binary sequence is used to indicate that the timing state is configured to be in a synchronized state or an unsynchronized state. The embodiment of the invention provides a downlink backhaul subframe structure configuration system. The downlink backhaul subframe structure configuration system according to the embodiment of the present invention includes a downlink backhaul subframe structure configuration apparatus and a relay station, where the downlink backhaul subframe structure configuration apparatus includes: a first configuration module, configured to perform downlink propagation delay according to the base station to the relay station Or the distance between the base station and the relay station, configuring the end point symbol of the backhaul transmission on the second slot of the relay downlink backhaul subframe and/or the timing state of the relay station; the second configuration module is set to be based on the end point symbol and/or the timing status , configure the downlink backhaul subframe structure. The second configuration module is in the base station or in the 0AM module or in the relay station. In the embodiment of the present invention, by configuring the end point symbol and/or the synchronization state flexibly, and configuring the downlink backhaul subframe structure, the self-interference of the downlink receiving end and the transmitting end of the relay station can be avoided, thereby ensuring system performance and user experience. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are set to illustrate,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, 1 is a schematic diagram of a structure of a relay network according to the related art; FIG. 2 is a schematic diagram of a subframe structure according to the related art; FIG. 3 is a schematic diagram of a structure of a downlink backhaul subframe in an asynchronous state according to the related art; 4 is a schematic diagram of a synchronization state downlink backhaul subframe structure according to the related art; FIG. 5 is a flowchart of a downlink backhaul subframe structure configuration method according to an embodiment of the present invention; FIG. 6 is a downlink backhaul according to a preferred embodiment of the present invention. FIG. 7 is an interaction flowchart of a downlink backhaul subframe structure configuration method according to a preferred embodiment 5 of the present invention; FIG. 8 is a downlink backhaul subframe structure configuration according to a preferred embodiment 7 of the present invention; FIG. 9 is an interaction flowchart of a downlink backhaul subframe structure configuration method according to a preferred embodiment 8 of the present invention; FIG. 10 is an interaction flow of a downlink backhaul subframe structure configuration method according to a preferred embodiment 10 of the present invention; FIG. 11 is a structural block diagram of a downlink backhaul subframe structure configuration system according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict. The invention will be described in detail below with reference to the drawings in conjunction with the embodiments. The embodiment of the invention provides a downlink backhaul subframe structure configuration method. FIG. 5 is a flowchart of a method for configuring a downlink backhaul subframe structure according to an embodiment of the present invention. As shown in FIG. 5, the following steps S502 to S504 are included. Step S502: Configure, according to a downlink propagation delay of the base station to the relay station or a distance between the base station and the relay station, an end point symbol of the backhaul transmission on the second slot of the relay downlink backhaul subframe and/or a timing state of the relay station. Step S504, the relay station configures a downlink backhaul subframe structure according to the end point symbol and/or the timing state. In the related art, the end symbol of the backhaul transmission on the second slot of the downlink backhaul subframe of the relay station is fixedly configured as symbol 5, so that when the base station and the relay station are far apart or when the relay station moves, the relay station is at the downlink receiving end and Very serious self-interference between the transmitters. In the embodiment of the present invention, by configuring the end point symbol and/or the synchronization state flexibly, and configuring the downlink backhaul subframe structure, self-interference can be avoided on the downlink receiving end and the transmitting end of the relay station, thereby ensuring system performance and user experience. In addition, considering that the main cause of self-interference is that the distance between the base station and the relay station is relatively long or the relay station moves, the present invention configures the end point symbol and/or timing according to the downlink propagation delay of the base station to the relay station or the distance between the base station and the relay station. The state, so that the problem of self-interference can be directly solved. Specifically, according to the base station There are four cases in which the downlink propagation delay of the relay station or the distance between the base station and the relay station configures the end point symbol and/or the timing state. In case 1, when the downlink propagation delay of the base station to the relay station is lower than or less than the preset threshold r _{P 7m} , the end point symbol and/or the timing state can be configured by the following two methods: Method 1, the configuration end point symbol is Symbol 5 and/or the configuration timing state is the synchronization state; Method 2, the configuration end point symbol is symbol 6 and/or the configuration timing state is the non-synchronization state. Case 2: When the downlink propagation delay of the base station to the relay station exceeds or falls below the preset threshold Γ _{Η 7Η2} , the end point symbol and/or the timing state can be configured by the following two methods: Method 1, the configuration end point symbol is Symbol 4 and/or the configuration timing state is a synchronization state; Method 2, the configuration end point symbol is symbol 6 and/or the configuration timing state is an asynchronous state. The preferred embodiment can also configure T _{P Tm} T _{P TH2} . Case 3: When the distance between the base station and the relay station is lower or lower than the preset threshold /) _m , the end point symbol and/or the timing status can be configured by the following two methods: Method 1, configure the end point symbol as a symbol 5 and/or configure the timing state to be the synchronization state; Method 2, configure the end point symbol to be symbol 6 and/or configure the timing state to be non-synchronous. Case 4: When the distance between the base station and the relay station exceeds or falls below the preset threshold /) _ra2 , the end point symbol and/or the timing status can be configured by the following two methods: Method 1, configure the end point symbol as a symbol 4 and/or configure the timing state to be the synchronization state; Method 2, configure the end point symbol to be symbol 6 and/or configure the timing state to be non-synchronous. The preferred embodiment can also configure D _Tm D _TH2 . In addition, the configuration of the end point symbol and/or the timing state may be performed by the relay station itself, the base station or the OAM module, which are described below. Manner 1: The relay station configures the end point symbol and/or timing state of the backhaul transmission on the second slot of its own downlink backhaul subframe. Manner 2: The base station configures the end point symbol of the backhaul transmission and/or the timing status of the relay station on the second slot of the downlink backhaul subframe of the relay station; the base station informs the relay station of the configuration result by using the high layer signaling and/or the X2 interface signaling. Manner 3: The OAM module configures the end point symbol of the backhaul transmission on the second slot of the downlink backhaul subframe of the relay station and/or the timing status of the relay station; the OAM module notifies the relay station of the configuration result through OAM signaling. In the third mode, the OAM module can also indirectly notify the relay station of the configuration result through OAM signaling, that is,

The OAM module informs the base station of the configuration result through OAM signaling; the base station informs the relay station through high layer signaling and/or X2 interface signaling and/or direct forwarding. In addition, for the configuration result of the non-base station configuration, the configuration result may also be notified to the base station, which may be notified by the following two methods: Method 1, the relay station will be configured through high layer signaling and/or X2 interface signaling and/or direct forwarding. The result informs the base station; Method 2, the 0AM module informs the relay station of the configuration result through 0AM signaling. Preferably, the higher layer signaling and / or X2 interface signaling and / or 0AM signaling includes a binary sequence for indicating that the end point symbol is configured as symbol 4, symbol 5 or symbol 6. 1. When the number of bits in the binary sequence is 1, you can configure the binary sequence to be "1" to indicate that the end point symbol is configured to 5, and the configuration binary sequence to "0" to indicate that the end point symbol is configured as 6, as shown in Table 3. It should be noted that the mapping relationship is only a preferred implementation manner, and any other mapping relationship adopting the inventive concept should be included in the protection scope of the present invention.

2. When the number of bits in the binary sequence is 2, you can configure the binary sequence to be "00" to indicate that the end point symbol is configured to 4, the configuration binary sequence to "01" to indicate that the end point symbol is configured to 5, and the configuration binary sequence to "11". The end point symbol is configured as 6, as shown in Table 4. It should be noted that the mapping relationship is only a preferred implementation manner, and any other mapping relationship adopting the inventive concept should be included in the protection scope of the present invention. Preferably, the higher layer signaling and/or the X2 interface signaling and/or the 0AM signaling comprise a binary sequence for indicating that the timing state is configured to be in a synchronized state or an unsynchronized state. Specifically, when the binary sequence is set to “0”, the timing state is configured as a synchronization state, and the configuration binary sequence is “0”, indicating that the timing state is configured to be in an asynchronous state. It should be noted that the mapping relationship is only a preferred implementation manner, and any other mapping relationship adopting the inventive concept should be included in the protection scope of the present invention. Table 3 The second slot structure configuration in the downlink backhaul subframe (1)

Table 4 The second slot structure configuration in the downlink backhaul subframe (2)

The implementation process of the embodiment of the present invention will be described in detail below with reference to examples. In the following examples, it is assumed that Γ _ρ — _Tm = T _{P TH2} = 15687;, D _Tm = D _TH2 = 15.3 km. In other embodiments, T _{P Tm} , T _{p m2} , D _mi , D _ra2 may also take other values. . The signaling field names "pdsch-End-rl l" and "synchronization-flag-rl 1" involved in the following embodiments are not special, and other names may exist. Preferred Embodiment 1 This preferred embodiment describes a process in which a base station configures an end point symbol and transmits it to a relay station. 6 is an interaction flowchart of a downlink backhaul subframe structure configuration method according to a preferred embodiment of the present invention. As shown in FIG. 6, when the downlink propagation delay of the relay station T _p = 2048 J _S exceeds the threshold T _{p mi} = 15687 , The base station configures the end symbol of the second slot in the downlink backhaul subframe of the relay station as symbol 6, and in the field pdsch-End-rl l ENUMERATED (5, 6) in the high-level signaling RN-SubframeConfig information element, pdsch The binary sequence value of -End-rl l is configured as "1" and sent to the relay station, indicating that the end point of the second slot in the downlink backhaul subframe of the relay station is configured as symbol 6.

Preferred Embodiment 2 This preferred embodiment 2 describes a procedure in which a base station configures a timing state and transmits it to a relay station. When the downlink propagation delay of the base station to the relay station _{ρ ρ} = 10247^ is lower than the threshold Γ _ρ — _Tm = 15687 , the base station configures the downlink timing state of the relay station to the synchronization state, and the field in the high-level signaling RN-SubframeConfig information element Synchronization - flag-rl 1 In INTEGER( 0, 1 ), the binary sequence value of |si synchronization-flag-rl 1 is configured as "0" and sent to the relay station, indicating that the downlink timing state of the relay is configured to be in sync.

Preferred Embodiment 3 This preferred embodiment 3 describes a procedure in which a base station configures a timing state and transmits it to a relay station. The distance between the base station and the relay station / ) = 0.51⁄2? Below the threshold /) _Tm = 153km, the base station configures the downlink timing state of the relay station to be in the synchronization state, and in the field synchronization-flag-rl l INTEGER ( 0, 1 ) in the high-level signaling RN-Subframe Config information element, The binary sequence value of the synchronization-flag-rl l is configured to be "0" and sent to the relay station, indicating that the downlink timing state of the relay station is configured to be in a synchronized state.

Preferred Embodiment 4 This preferred embodiment 4 describes a procedure in which a base station configures an end point symbol and transmits it to a relay station. The distance between the base station and the relay station / ) = 0.51⁄2? Below the threshold /) _Tm = 153km, the base station configures the end symbol of the second slot in the downlink backhaul subframe of the relay station as symbol 6, and the field pdsch-End-rl in the higher layer signaling RN-SubframeConfig information element In ENUMERATED ( 5 , 6 ), the binary sequence value of pdsch-End-rl l is configured as " 1 " and sent to the relay station, indicating that the end symbol of the second slot in the downlink backhaul subframe of the relay station is configured as symbol 6.

Preferred Embodiment 5 This preferred embodiment 5 describes the process in which the OAM module configures the timing status and transmits it to the base station and the relay station. 7 is an interaction flowchart of a downlink backhaul subframe structure configuration method according to a preferred embodiment 5 of the present invention. As shown in FIG. 7, the downlink propagation delay of the base station to the relay station is 10247^ below the threshold _{ρ ρ} — _Tm = 15687 . The OAM module then configures the downlink timing state of the relay station to be asynchronous. And in OAM signaling, the field will be The binary sequence value of synchronization-flag-rll is configured to be "1", sent to the base station and the relay station, indicating that the downlink timing state of the relay station is configured to be in an asynchronous state.

Preferred Embodiment 6 This preferred embodiment describes a process in which a base station configures an end point symbol and transmits it to a relay station. The downlink propagation delay of the base station to the relay station T _p = 2048 J _S exceeds the threshold T _{p mi} = 15687 , the base station configures the end symbol of the second slot in the downlink backhaul subframe of the relay station as symbol 6, and in the X2 interface signaling The binary sequence value of the field pdsch-End-rll is configured to be "1" and sent to the relay station, indicating that the end symbol of the second slot in the downlink backhaul subframe of the relay station is configured as symbol 6.

Preferred Embodiment 7 This preferred embodiment 7 describes the process in which the OAM module configures the end point symbol and transmits it to the relay station, which is then forwarded by the relay station to the base station. 8 is an interaction flowchart of a downlink backhaul subframe structure configuration method according to a preferred embodiment of the present invention. As shown in FIG. 8, the downlink propagation delay of the base station to the relay station = 20487^ exceeds the threshold Γ _ρ — ^ ₂ = 15687 . Then, the OAM module configures the end symbol of the second slot in the downlink backhaul subframe of the relay station as symbol 4, and in the OAM signaling, configures the binary sequence value of the field pdsch-End-rll as "00", and sends it to the relay station. And then forwarded to the base station by the relay station, indicating that the end point symbol of the second slot in the downlink backhaul subframe of the relay station is configured as symbol 4.

Preferred Embodiment 8 This preferred embodiment VIII describes a process in which an OAM module configures a timing state and transmits it to a relay station, which is then forwarded by the relay station to the base station. 9 is an interaction flowchart of a downlink backhaul subframe structure configuration method according to a preferred embodiment 8 of the present invention. As shown in FIG. 9, the downlink propagation delay of the base station to the relay station T _p = 2048 J _S exceeds the threshold T _{p mi} = 15687 . The OAM module configures the downlink timing state of the relay station to be in a synchronized state, and in the OAM signaling, the binary sequence value of the field synchronization-flag-rll is configured to be "0", sent to the base station, and then forwarded by the base station to the relay station, indicating The downlink timing state of the relay station is configured to be in a synchronized state. The base station configures the end symbol of the second slot in the downlink backhaul subframe of the relay station as symbol 4, and in the field pdsch-End-rll ENUMERATED (4, 5) in the high-level signaling RN-SubframeConfig information element, the field pdsch The binary sequence value of -End-rll is configured as "0" and sent to the relay station, indicating that the end symbol of the second slot in the downlink backhaul subframe of the relay station is configured as symbol 4.

Preferred embodiment nine

The preferred embodiment IX describes the process in which the OAM module configures the timing status and sends it to the relay station, which is then forwarded by the relay station to the base station. The distance between the base station and the relay station / ) = 0.51⁄2? Below the threshold /) _Tm = \53km, the OAM module configures the downlink timing state of the relay station to be in the synchronized state. In the OAM signaling, the binary sequence value of the field synchronization-flag-rll is configured to be "0", sent to the base station, and then forwarded by the base station to the relay station, indicating that the downlink timing state of the relay station is configured to be in a synchronized state.

Preferred Embodiment Ten Preferred Embodiment 10 describes a process in which a relay station itself configures an end point symbol and then transmits it to a base station. 10 is an interaction flowchart of a downlink backhaul subframe structure configuration method according to a preferred embodiment 10 of the present invention. As shown in FIG. 10, a downlink propagation delay of a base station to a relay station is 7 _? = 20487 ₅ exceeding a threshold Γ _{Η 7Η 2} = 15687 . Then, the relay station itself configures the end point symbol of the second slot in the downlink backhaul subframe of the relay station as symbol 6. In the high-level signaling, the binary sequence value of the field pdsch-End-rll is configured to be "1" and sent to the base station, indicating that the end symbol of the second slot in the downlink backhaul subframe of the relay station is configured as symbol 6.

PREFERRED EMBODIMENT A preferred embodiment 11 describes a process in which a relay station itself configures a timing state and then transmits it to a base station. When the distance between the base station and the relay station is 0·5^ at the threshold H, the relay station itself configures the downlink timing state of the relay station to the synchronization state. And in the high layer signaling, the field synchronization-flag-rll The binary sequence value is configured to be "0" and sent to the base station, indicating that the downlink timing state of the relay station is configured to be in a synchronized state.

Preferred Embodiment 12 This preferred embodiment 12 describes a procedure in which a base station configures an end point symbol and transmits it to a relay station. The distance between the base station and the relay station / ) = 0.51⁄2? Below the threshold /) _Tm = 153km, the base station configures the end point symbol of the second slot in the downlink backhaul subframe of the relay station as symbol 5, and configures the relay station timing state to the synchronization state. And in the field pdsch-End-rl l ENUMERATED (4, 5) in the high-level signaling RN-SubframeConfig information element, the binary sequence value of pdsch-End-rl l is configured as "1", and sent to the relay station to indicate the relay station. The end symbol of the second slot in the downlink backhaul subframe is configured as symbol 5. And, in the field synchronization-flag-rl l INTEGER ( 0, 1 ) in the high-level signaling RN-SubframeConfig information element, the base station configures the binary sequence value of the synchronization-flag-rl l to “0” and sends it to the relay station. Indicates that the downlink timing state of the relay station is configured to be in a synchronized state. It should be noted that the steps shown in the flowchart of the accompanying drawings may be performed in a computer system such as a set of computer executable instructions, and, although the logical order is shown in the flowchart, in some cases, The steps shown or described may be performed in an order different than that herein. The embodiment of the invention provides a downlink backhaul subframe structure configuration system, and the downlink backhaul subframe structure configuration system can be used to implement the downlink backhaul subframe structure configuration method. FIG. 11 is a structural block diagram of a downlink backhaul subframe configuration configuration system, as shown in FIG. 11, including a downlink backhaul subframe configuration apparatus 112 and a relay station 114, wherein the downlink backhaul subframe configuration apparatus 112 includes A configuration module 1122 and a second configuration module 1124 are described in detail below. The first configuration module 1122 is configured to set an end point symbol and/or a relay station 114 for the backhaul transmission on the second slot of the downlink backhaul subframe of the relay station 114 according to the downlink propagation delay of the base station to the relay station 114 or the distance between the base station and the relay station 114. The second configuration module 1124 is connected to the first configuration module 1122, and configured to configure the downlink backhaul subframe structure according to the end point symbol and/or the timing status configured by the first configuration module 1122. Preferably, the second configuration module 1124 is in the base station or in the 0AM module or in the relay station 114. It should be noted that the downlink backhaul subframe structure configuration system described in the device embodiment corresponds to the foregoing method embodiment, and the specific implementation process has been described in detail in the method embodiment, and details are not described herein again. In summary, according to the above embodiments of the present invention, a downlink backhaul subframe structure configuration method and system are provided. By flexibly configuring the end point symbol and/or the synchronization state, and configuring the downlink backhaul subframe structure, the present invention can avoid self-interference of the downlink receiving end and the transmitting end of the relay station, thereby ensuring system performance and user experience. Obviously, those skilled in the art should understand that the above modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device, such that they may be stored in the storage device by the computing device, or they may be separately fabricated into individual integrated circuit modules, or they may be Multiple modules or steps are made into a single integrated circuit module. Thus, the invention is not limited to any specific combination of hardware and software. The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Claims

Claim

A downlink backhaul subframe structure configuration method, including:

Performing, according to a downlink propagation delay of the base station to the relay station or a distance between the base station and the relay station, an end point symbol of the backhaul transmission on the second slot of the downlink backhaul subframe of the relay station, and/or a timing state of the relay station Configuration

The relay station configures a downlink backhaul subframe structure according to the end point symbol and/or the timing state.

2. The method according to claim 1, wherein, in a case where a downlink propagation delay of the base station to the relay station is lower than or not exceeding a preset first threshold, the downlink backhaul subframe is second to the relay station. The end point symbol of the backhaul transmission on the slot and/or the timing status of the relay station is configured to include the following configuration: the end point symbol is the symbol 5 and/or the timing state is configured as the synchronization state; the end point symbol is configured as the symbol 6 And/or configuring the timing state to be an asynchronous state.

The method according to claim 1, wherein, in the case that the downlink propagation delay of the base station to the relay station exceeds or does not fall below a preset second threshold, the downlink backhaul subframe is second to the relay station. The end point symbol of the backhaul transmission on the slot and/or the timing status of the relay station is configured to include the following configuration: the end point symbol is the symbol 4 and/or the timing status is the synchronization state; the end point symbol is configured as the symbol 6 And/or configuring the timing state to be an asynchronous state.

4. The method according to claim 1, wherein, in the case that the distance between the base station and the relay station is lower than or not exceeding a preset third threshold, the second downlink downlink subframe of the relay station is The configuration of the end point symbol of the backhaul transmission on the slot and/or the timing status of the relay station includes one of the following: configuring the end point symbol to be symbol 5 and/or configuring the timing status to be a synchronization state; configuring the end point symbol as a symbol 6 and/or configuring the timing state to be an asynchronous state.

The method according to claim 1, wherein, in the case that the distance between the base station and the relay station exceeds or does not fall below a preset fourth threshold, the second downlink downlink subframe of the relay station is The configuration of the end point symbol of the backhaul transmission on the slot and/or the timing status of the relay station includes one of the following: Configuring the end point symbol to be symbol 4 and/or configuring the timing state to be a synchronization state; configuring the end point symbol to be symbol 6 and/or configuring the timing state to be an unsynchronized state.

6. The method according to claim 1, wherein configuring an end point symbol of a backhaul transmission on a second slot of the relay downlink backhaul subframe and/or a timing state of the relay station comprises: the relay station to itself The end point symbol and/or timing status of the backhaul transmission on the second slot of the downlink backhaul subframe is configured.

The method according to claim 1, wherein configuring the end point symbol of the backhaul transmission on the second slot of the relay downlink backhaul subframe and/or the timing status of the relay station comprises:

The base station configures an end point symbol of the backhaul transmission on the second slot of the relay downlink backhaul subframe and/or a timing state of the relay station;

The base station informs the relay station of the configuration result through high layer signaling and/or X2 interface signaling.

8. The method according to claim 1, wherein configuring the end point symbol of the backhaul transmission on the second slot of the relay downlink backhaul subframe and/or the timing status of the relay station comprises:

The operation and maintenance management 0AM module configures an end point symbol of the backhaul transmission on the second slot of the relay downlink backhaul subframe and/or a timing state of the relay station;

The 0AM module informs the relay station of the configuration result by using 0AM signaling.

9. The method according to claim 8, wherein the 0AM module notifies the relay station of the configuration result by using 0AM signaling, including:

The 0AM module notifies the base station of the configuration result by using the 0AM signaling; the base station informs the relay station by using high layer signaling and/or X2 interface signaling and/or direct forwarding.

The method according to any one of claims 6 to 9, wherein, after the relay station receives the configuration result, the method further comprises: the relay station transmitting a high layer signaling and/or an X2 interface letter The and/or direct forwarding informs the base station of the configuration result.

The method according to any one of claims 6 to 9, wherein the high layer signaling and/or the X2 interface signaling and/or the 0AM signaling comprise a first binary sequence, wherein The first binary sequence is used to indicate that the end point symbol is configured as symbol 4, symbol 5 or symbol 6.

The method according to any one of claims 6 to 9, wherein the high layer signaling and/or the X2 interface signaling and/or the OAM signaling comprise a second binary sequence, wherein The second binary sequence is used to indicate that the timing state is configured to be a synchronous state or an asynchronous state.

A downlink backhaul subframe structure configuration system, including a downlink backhaul subframe structure configuration apparatus and a relay station, where the downlink backhaul subframe structure configuration apparatus includes:

a first configuration module, configured to set, according to a downlink propagation delay of the base station to the relay station or a distance between the base station and the relay station, an end point symbol of a backhaul transmission on a second slot of the downlink backhaul subframe of the relay station / or the timing status of the relay station is configured;

The second configuration module is configured to configure a downlink backhaul subframe structure according to the end point symbol and/or the timing state.

14. The system of claim 13, wherein the second configuration module is within a base station or within an operational maintenance management 0AM module or within the relay station.