WO2012167639A1

WO2012167639A1 - Method and device for configuring format of downlink control channel

Info

Publication number: WO2012167639A1
Application number: PCT/CN2012/072246
Authority: WO
Inventors: 袁明; 毕峰; 梁枫; 杨瑾; 吴栓栓
Original assignee: 中兴通讯股份有限公司
Priority date: 2011-06-10
Filing date: 2012-03-13
Publication date: 2012-12-13
Also published as: CN102821421A

Abstract

Disclosed are a method and device for configuring the format of a downlink control channel. The method includes: the network side configuring the format of a downlink control channel for a mobile terminal by way of high-layer signalling, or the network side pre-configuring the format of the downlink control channel for the mobile terminal, wherein the format of the downlink control channel consists of one or more of {1, 2, 4, 8, 16, 32} CCEs or RB pairs. By way of the present invention, extending the format of the downlink control channel as {1, 2, 4, 8, 16, 32} and configuring the same can be well applied to a mobile relay (or a terminal with a higher version), increasing the accuracy of receiving downlink control information on an Un link by the mobile relay, decreasing the code error rate of data transmission, and in turn improving the transmission efficiency of the entire communication system.

Description

The present invention relates to the field of communications, and in particular to a method and an apparatus for configuring a downlink control channel format. BACKGROUND The Long Term Evolution (LTE) system, the LTE-Advanced (LTE-A) system, and the International Mobile Telecommunication Advanced (IMT-Advanced) system are all Based on Orthogonal Frequency Division Multiplexing (OFDM) technology, the OFDM system is a time-frequency two-dimensional data format. A subframe consists of two slots. When the normal cyclic prefix (Normal Cyclic Prefix, Normal CP for short), each slot consists of 7 OFDM symbols. When extending CP (Extended CP), each The slots consist of 6 OFDM symbols. The downlink control channel (PDCCH) is used to carry scheduling configuration information (including downlink scheduling grant information (DL grant) and uplink scheduling grant information (UL grant)) and other control information (including system messages). System Information (referred to as SI), Random Access (RA) response, paging related information); PDCCH is located in the first 1 or 2 or 3 of the 1st time slot of each subframe or On 4 OFDM symbols. In the LTE/LTE-A system, the design of the PDCCH consists of several different components, each of which has its specific function. For convenience of description, several terms and conventions are described below: Resource Element (RE): The smallest time-frequency resource block occupying 1 subcarrier on 1 OFDM symbol. Resource Element Group (REG): According to the position of the reference symbol on each OFDM symbol, one REG can be composed of 4 or 6 REs. Control Channel Element (CCE): It consists of 36 REs and 9 REGs. Physical Resource Block (PRB for short): 1 time slot in the time domain and 12 consecutive subcarriers in the frequency domain. Physical resource block pair (PRB pair): One consecutive subframe in the time domain and 12 consecutive subcarriers in the frequency domain. PDCCH format: The PDCCH consists of one or more consecutive CCEs and can only be composed of L CCEs, where e {1, 2, 4, 8}, that is, only 4 types are supported in LTE/LTE-A. Fixed PDCCH format, as shown in Table 1.

Table 1 PDCCH formats supported in LTE/LTE-A

If the channel conditions are good, a higher code rate is used, that is, the PDCCH is composed of fewer CCEs, for example, L = 1 or 2; if the channel conditions are poor, a lower code rate is used, that is, the PDCCH is composed of more CCEs. , to ensure the success rate of transmission of control information, such as L = 4 or 8. 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. In order to increase the high data rate, group mobility, coverage of temporary network deployment, increase the throughput of the cell edge, and provide services for users within the coverage vulnerability of the cellular system, a relay technology is introduced in the wireless communication system. Therefore, relay technology is regarded as a key technology of 4G. In a mobile communication system in which a relay node (Relay Node, RN for short) is introduced, a link between a base station (e B ) and an RN is called a backhaul link (also referred to as Un Link), and an RN is used. The link between the user equipment (User Equipment, UE for short) in the coverage area is called the access link (also called the Uu Link), and the link between the eNB and the UE under its coverage is called the link. It is a Direct Link. For the eNB, the RN is equivalent to one UE; for the UE, the RN is equivalent to the eNB. Relay nodes can be divided into two types, namely, in-band relay nodes and out-of-band relay nodes. 1 is a schematic diagram of a system architecture after introducing an in-band relay node according to the related art. As shown in FIG. 1, for an in-band RN, Un Link and Uu Link use the same frequency band. , Un Link and Uu Link both use _;. In order to avoid the RN's own transmission and reception interference, the RN cannot simultaneously perform transmission and reception operations on the same frequency resource. When the RN sends downlink control information to its subordinate UE, it does not receive downlink control information from the eNB. Therefore, in downlink transmission, the RN first gives it to the first 1 or 2 OFDM symbols. The genus UE transmits downlink control information, and then performs handover from transmission to reception within a certain period of time (such as the interval gap shown in FIG. 2). After the handover is completed, the data from e B is received on the following OFDM symbol. The relay physical downlink control channel (Relay Physical Downlink Control Channel, R-PDCCH for short) and the physical downlink shared channel (Physical Downlink Shared Channel, PDSCH for short) are shown in FIG. 2, that is, the eNB sends the RN to the RN. The R-PDCCH is carried on a physical resource block or a physical resource block pair. 3 is a schematic diagram of a system architecture after introducing an outband relay node according to the related art. As shown in FIG. 3, for an out-band RN, Un Link and Uu Link occupy completely different For two bands, Un Link uses _;, Uu Link uses / ₂ . Therefore, the out-of-band RN can receive (transmit) on / ₂ while transmitting (receiving) on _; without interference between each other.

The R-PDCCH may or may not be interleaved during transmission. The inter-interleaved R-PDCCH (with cross-interleaving) means that the DL grants of all RNs in one subframe are interleaved and then carried on the available resources of the first slot; the UL grant of all RNs in one subframe Inter-interleaved and carried in the available resources of the second time slot, that is, the R-PDCCH carrying multiple RNs in one RB pair. The non-interleaved R-PDCCH (without cross-interleaving) means that the eNB uses the high-layer signaling to configure the R-PDCCH for the RN semi-static configuration. The DL grant of the RN is The first time slot is transmitted on the available resources, and the UL grant of the RN is transmitted on the available resources of the second time slot, that is, one PRB pair can only carry the R-PDCCH of the same RN, but cannot be used by multiple RNs. Shared. For the inband RN, two different R-PDCCH formats have been defined, namely, R-PDCCH formats with cross-interleaving and non-interleaved R-PDCCH formats (R-PDCCH formats without Cross-interleaving ). Specifically: interlaced R-PDCCH format: R-PDCCH can only be composed of L CCEs, where J e {1, 2, 4, 8}, that is, the format directly following the PDCCH, the same as Table 1; non-interleaved R- PDCCH format: R-PDCCH can only consist of RB pairs, where Λ e {1, 2, 4, 8}. In the 3GPP discussion, Mobile Relay (MR) is about to become a hot issue. Due to the high-speed movement, a large Doppler frequency offset is generated, and the OFDM system is highly susceptible to frequency offset, that is, a small frequency offset will destroy the orthogonality between subcarriers, which makes it difficult for users to correct. Receive data. Furthermore, the increase of the Doppler frequency offset also makes the channel coherence time shorter, which leads to a rapid change of the wireless channel, which also seriously affects the correct reception of data. SUMMARY OF THE INVENTION The present invention provides a method and apparatus for configuring a downlink control channel format to at least solve the problem that the high-speed mobile relay in the related art affects the accurate reception of the downlink control channel. In order to achieve the above object, according to an aspect of the present invention, a method for configuring a downlink control channel format is provided. The configuration method of the downlink control channel format according to the present invention includes: the network side configures a downlink control channel format for the mobile terminal by using the high layer signaling, or the network side preconfigures the downlink control channel format for the mobile terminal, where the downlink control channel format is {1 2, 4, 8, 16, 32 } One or more of CCE or RB pair. The network side configures the downlink control channel format for the mobile terminal by using the high layer signaling. The network side indicates that the mobile relay configures one or more downlink control channel formats by using N bits of high layer signaling, where N is the downlink control supported by the mobile relay. The number of channel formats, each bit of the N-bit high layer signaling is used to indicate one of the downlink control channel formats supported by the mobile relay. Before the network side configures the downlink control channel format for the mobile terminal by using the high layer signaling, the method further includes: the network side acquiring the decision parameter from the mobile terminal; the network side comparing the decision parameter with a preset decision threshold; Based on the comparison result, a downlink control channel format for configuring the mobile terminal is determined. Before the determining, by the network side, the downlink control channel format for configuring the mobile terminal, the method further includes: the network side and the mobile terminal pre-setting one or more downlink control channel formats corresponding to the decision threshold. The combination of each of the downlink control channel formats includes one or more downlink control channel formats; the network side determines, according to the comparison result, the downlink control channel format used for configuring the mobile terminal, including: the network side according to the comparison result, Determining, by a combination of one or more downlink control channel formats, a combination of downlink control channel formats for configuring the mobile terminal; the network side instructing the mobile terminal to select a combination of the determined downlink control channel formats by using M-bit high layer signaling Configuration, where M corresponds to the number of combinations of downlink control channel formats. The decision parameters include at least one of the following: moving speed, Doppler shift, channel quality, bit error rate, signal strength. The network side pre-configuring the downlink control channel format for the mobile terminal includes: The network side pre-configures a fixed downlink control channel format for the mobile terminal. Before the network side pre-configures the fixed downlink control channel format for the mobile terminal, the method further includes: the network side and the mobile terminal preset a group of one or more downlink control channel formats corresponding to the decision threshold. The combination of each of the downlink control channel formats includes one or more downlink control channel formats, and the combination of each downlink control channel format corresponds to a network-side and mobile terminal pre-configured value; the network side is pre-configured for the mobile terminal. The fixed downlink control channel format includes: the network side determines a combination of the corresponding downlink control channel format according to the determined downlink control channel format; and the network side configures, by using a default value, the mobile terminal to select a combination of the determined downlink control channel formats. In the case that the decision threshold is multiple, the combination of the network side and the mobile terminal pre-setting the one or more downlink control channel formats corresponding to the decision threshold includes: determining that the multiple decision thresholds are formed Multiple interval ranges; respectively, a combination of downlink control channel formats corresponding to a plurality of interval ranges. The network side includes one of the following: e B, RN, Gateway (GateWay, GW for short), Mobile Management Entity (MME), Evolved Universal Telecommunication Radio Access Network (Evolved Universal Telecommunication Radio Access Network, Referred to as EUTRAN, Operation Administration and Maintenance (OAM) manager. The mobile terminal includes one of the following: Mobile relay, a higher version of the user equipment. In order to achieve the above object, according to another aspect of the present invention, a configuration apparatus for a downlink control channel format is provided. The configuration apparatus of the downlink control channel format according to the present invention includes: a first configuration module, configured to configure a downlink control channel format for the mobile terminal by using high layer signaling, where the downlink control channel format is {1, 2, 4, 8, 16, 32 } One or more of CCE or RB pair; The second configuration module is configured to pre-configure a downlink control channel format for the mobile terminal. With the present invention, extending the downlink control channel format to { 1, 2, 4, 8, 16, 32 } and configuring the downlink control channel format can be well applied to mobile relay (or a later version of the terminal), improving the mobile Following the accuracy of receiving downlink control information on the Unlink, the error rate of data transmission is reduced, thereby improving the transmission efficiency of the entire communication system. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are set to illustrate,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, In the drawings: FIG. 1 is a schematic diagram of a system architecture after an in-band relay node is introduced according to the related art; FIG. 2 is a schematic diagram of a frame structure of a downlink Un subframe according to an in-band relay node according to the related art; 3 is a schematic diagram of a system architecture after introducing an outband relay node according to the related art; FIG. 4 is a structural block diagram of a device for configuring a downlink control channel format 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 method for configuring a downlink control channel format. The method includes: configuring, by the network side, a downlink control channel format for the mobile terminal by using high layer signaling, or preconfiguring a downlink control channel format for the mobile terminal by the network side, where the downlink control channel format is {1, 2, 4, 8, 16, 32 } One or more of a CCE or RB pair. In the related art, high-speed movement of a mobile relay affects accurate reception of a downlink control channel. In the embodiment of the present invention, the extended downlink control channel format is {1, 2, 4, 8, 16, 32} and the downlink control channel format is configured to be suitable for mobile relay (or a later version of the terminal), The mobile relay receives the accuracy of the downlink control information on the Unlink, reduces the bit error rate of the data transmission, and improves the transmission efficiency of the entire communication system. It should be noted that the foregoing configuration method of the downlink control channel format can be applied not only to mobile relay but also to other terminals, such as some higher-level terminals. It should be noted that the downlink control channel of the mobile relay supports six formats, that is, in the case of interleaving, the downlink control channel of the mobile relay can be {1, 2, 4, 8, 16, 32} CCEs. Composition; In the case of non-interleaving, the downlink control channel of the mobile relay may be composed of {1, 2, 4, 8, 16, 32} RB pairs. Preferably, the network side configures the downlink control channel format for the mobile terminal by using the high layer signaling, where the network side indicates that the mobile relay configures one or more downlink control channel formats by using N bits of high layer signaling, where N is mobile relay support. The number of downlink control channel formats, each bit of the N-bit high layer signaling is used to indicate one of the downlink control channel formats supported by the mobile relay. In the preferred embodiment, for the six downlink control channel formats supported by the mobile relay, the downlink control channel format can be indicated by using 6-bit high-layer signaling (ie, bitmap mode). . For example, 111100 can be used to represent the downlink control channel format as {1, 2, 4, 8}, and 001111 can be used to represent the downlink control channel format as {4, 8, 16, 32}, and 001100 can be used to represent the downlink control channel format as { 4, 8}, can use 000110 to represent the downlink control channel format as {8, 16}. Therefore, the method of the preferred embodiment is very simple and can ensure the reliability of downlink control channel transmission. Preferably, before the network side configures the downlink control channel format for the mobile terminal by using the high layer signaling, the method further includes: the network side acquiring the decision parameter from the mobile terminal; and the network side comparing the decision parameter with the preset decision threshold. The network side determines the downlink control channel format used to configure the mobile terminal according to the comparison result. Preferably, before determining, by the network side, the downlink control channel format for configuring the mobile terminal, the method further includes: the network side and the mobile terminal preset one or more downlinks corresponding to the decision threshold. a combination of control channel formats, where the combination of each downlink control channel format includes one or more downlink control channel formats; and the network side determines, according to the comparison result, a downlink control channel format for configuring the mobile terminal, including: Determining, in a combination of the corresponding one or more downlink control channel formats, a combination of downlink control channel formats for configuring the mobile terminal; the network side instructing the mobile terminal to select the determined downlink control channel format by using M-bit high layer signaling The combination is configured, where M corresponds to the number of combinations of downlink control channel formats. The preferred embodiment can reduce the number of bits of higher layer signaling by means of a combination of downlink control channel formats. For example, for the six downlink control channel formats supported by mobile relay {1, 2, 4, 8, 16, 32}, {4, 8, 16, 32}, {4, 8}, {8 can be preset. , 16}, {16, 32}, {4}, {8}, {16}, {32} a combination of eight downlink control channel formats. Therefore, the base station only needs to indicate mobile relay through 3-bit high-level signaling. The downlink control channel format in the combination of the corresponding downlink control channel formats is selected for configuration, thereby reducing the number of bits of higher layer signaling. It should be noted that the value of M is preferably rounded up to 1^<), where L is the number of combinations of downlink control channel formats (8 in the preferred embodiment). In the preferred embodiment, when the decision parameter is greater than a preset decision threshold, a combination of the downlink control channel formats having a larger value of the included downlink control channel format is configured. For example, for the six downlink control channel formats supported by the mobile relay, the downlink control signaling format may be configured when the decision parameter is greater than a preset threshold. The combination is in the eight combinations of {4, 8, 16, 32}, {4, 8}, {8, 16}, {16, 32}, {4}, {8}, {16}, {32} One type, which one can be specifically indicated by the base station high layer signaling or by the mobile relay default. Similarly, when the decision parameter is smaller than the preset decision threshold, a combination of the downlink control channel formats with smaller values of the included downlink control channel format is configured. For example, for the six downlink control channel formats supported by the mobile relay, the downlink control signaling format may be configured when the decision parameter is smaller than a preset threshold. The combination is in the combination of {1, 2, 4, 8}, {1, 2}, {2, 4}, {4, 8}, {1}, {2}, {4}, {8} One type, which one can be specifically indicated by the base station high layer signaling or by the mobile relay default. Preferably, the decision parameter comprises at least one of the following: a moving speed, a Doppler shift, a channel quality, a bit error rate, and a signal strength. Preferably, the network side pre-configuring the downlink control channel format for the mobile terminal comprises: the network side pre-configuring a fixed downlink control channel format for the mobile terminal. Preferably, before the network side pre-configures the fixed downlink control channel format for the mobile terminal, the method further includes: the network side and the mobile terminal pre-setting one or more downlink control channel formats corresponding to the decision threshold. Combination, wherein each combination of downlink control channel formats includes one or more downlink control channel formats, each combination of downlink control channel formats corresponds to a network side and a mobile terminal preconfigured value; and the network side is preconfigured for the mobile terminal The fixed downlink control channel format includes: the network side determines a combination of the corresponding downlink control channel format according to the determined downlink control channel format; and the network side configures, by using a default value, the mobile terminal to select a combination of the determined downlink control channel formats. Preferably, in a case that the determination threshold is multiple, the combination of the network side and the mobile terminal presetting the one or more downlink control channel formats corresponding to the decision threshold includes: determining the multiple decision gates A plurality of interval ranges formed by the limit values; and combinations of downlink control channel formats corresponding to the plurality of interval ranges are respectively arranged. Preferably, the network side comprises one of the following: e B, RN, GW, MME, EUTRAN OAM manager. Preferably, the mobile terminal comprises one of the following: a mobile relay, a higher version of the user equipment. In summary, the method of the present invention can be well applied to mobile relay (a later version of the terminal), improves the transmission reliability of the downlink control channel of the mobile relay in a high-speed mobile scenario, and improves the mobility. The accuracy of the relay receiving the downlink control information on the Unlink reduces the bit error rate of the data transmission, thereby improving the transmission efficiency of the entire communication system. The implementation process of the embodiment of the present invention will be described in detail below with reference to examples. Preferred Embodiment 1 This preferred embodiment 1 describes a process of configuring a supported downlink control channel format for a mobile relay using higher layer signaling. The downlink control channel of the mobile relay supports six formats, that is, in the case of interleaving, the downlink control channel of the mobile relay can be composed of {1, 2, 4, 8, 16, 32 } CCEs; In this case, the downlink control channel of the mobile relay may be composed of {1, 2, 4, 8, 16, 32 } RB pairs. The downlink control channel format supported by the mobile relay is configured by the base station by using high layer signaling. The high-level signaling adopts the bitmap method, that is, 6 bits are required, and specifically, the format corresponding to "1" is configured; The format is not configured. For example, 111100 represents a supportable downlink control channel format of {1, 2, 4, 8} CCEs or RB pairs. 001111 represents a supportable downlink control channel format of {4, 8, 16, 32} CCE or RB pair. 001100 represents a supportable downlink control channel format of {4, 8} CCEs or RB pairs. 000110 represents a supportable downlink control channel format of {8, 16} CCE or RBpair. Preferred Embodiment 2 This preferred embodiment 2 describes a process of configuring a supportable downlink control channel format for a mobile relay by using higher layer signaling when the speed of the mobile relay exceeds the decision threshold. For a mobile relay with in-band/out-of-band and downlink control channels in an interleaved manner, the downlink control channel of the mobile relay is composed of L CCEs. In order to ensure the reliability of the downlink control channel reception, the base station uses the high layer signaling to configure any one of the following four supported downlink control channel formats (corresponding to Table 2 to Table 5) for the mobile relay. Specifically, the base station uses any one of Tables 2 to 5 for the mobile relay configuration by using 2-bit high layer signaling. For example, "00" corresponds to Table 2; "01" corresponds to Table 3; "10" corresponds to Table 4; "11" corresponds to Table 5; Table 2 Supports Downstream Control Channel Format (Je {4,8,16,32} )

Table 5 Supported Downlink Control Channel Formats (J e {16,32} )

For in-band/out-of-band and downlink control channels using non-interleaved mobile relays, the downlink control channel of the mobile relay consists of one RB pair. In order to ensure the reliability of the downlink control channel reception, the base station uses the high-layer signaling to configure any of the following four supported downlink control channel formats (corresponding to Table 6 to Table 9) for the mobile relay. Specifically, the base station uses any one of Tables 6 to 9 for mobile relay configuration using 2-bit high layer signaling. For example, "00" corresponds to Table 6; "01" corresponds to Table 7; "10" corresponds to Table 8; "11" corresponds to Table 9; Table 6 Supports Downstream Control Channel Format (Ae {4, 8, 16, 32} )

Table 9 Supportable Downlink Control Channel Formats (Ae {16,32})

Preferred Embodiment 3 The preferred embodiment 3 describes a process of configuring a supportable downlink control channel format for a mobile relay by using higher layer signaling when the channel quality of the mobile relay is less than the decision threshold. When the channel quality of the mobile relay is less than or equal to the threshold, the inband/outband and downlink control channels are interleaved.

For non-interleaved mobile relay, the base station can configure J or { e {l, 2, 4, 8} or J or Λ e {1, 2} or J or Λ e {2, 4} or J or Λ e {4, 8} or J or Λ e {1} or J or Λ e {2} or J or Λ e {4} or one or more of J or {8}. Similar to the preferred embodiment 2, the base station configures any one of the above eight supported downlink control channel formats for the mobile relay by using high layer signaling. For example, the base station uses 3-bit high-level signaling "000" for mobile relay configuration or Ae {1, 2, 4, 8}; "001" configuration uses J or Ae {1, 2}; "010" configuration J or Ae {2, 4}; "011" configuration uses J or Ae {4, 8}; "100" configuration uses J or Ae {1}; "101" configuration uses J or Ae {2}; "110" Configure to use J or Ae {4}; "111" configuration uses J or Ae {8}. Preferred Embodiment 4 This preferred embodiment 3 describes a procedure for configuring a supportable downlink control channel format for a mobile relay by default in a manner in which the mobile relay moves faster than the decision threshold. The base station and the mobile relay negotiate with each other. As long as the moving speed of the mobile relay or other decision parameters is greater than the threshold of its corresponding preset value, the base station and the mobile relay can support the downlink control channel format by default as J or Ae { 4, 8,16,32} or J or Ae {4, 8} or J or Ae {8, 16} or J or Ae {16,32} or G or _{Λ G} {8} or {16} One type, there is no need to use high-level signaling for configuration. Similarly, as long as the moving speed of the mobile relay or other decision parameters is less than or equal to the threshold value of the corresponding preset value, the downlink control channel format supported by the base station and the mobile relay by default is J or {1, 2, 4, 8} or

J or {1, 2} or J or {2, 4} or J or {4, 8} or J or {1} or J or {2} or J or {4} or one of J or {8} In this case, there is no need to use high-level signaling for configuration. Preferred Embodiment 5 This preferred embodiment 5 describes a procedure for configuring a supportable downlink control channel format for a mobile relay using higher layer signaling in the case of a signal strength of a mobile relay and a plurality of decision thresholds. The base station pre-sets the threshold values of the four signal strengths, which are as follows: WI The above four thresholds are divided into five types of interval ranges, and each range includes a plurality of supportable downlink control signaling formats. For example, when the signal strength is less than or equal to, the supported downlink control format is either eight £{8,16} or J or {16,32}; when the signal strength is greater than /, less than or equal to / ₂ , the supported downlink control The format is J or Ae{4,8} or J or Ae{8,16} _; when the signal strength is greater than / _{2 and} less than or equal to / ₃ , the supported downlink control format is J or Ae{2, 4} or J or Ae{4,8} _; when the signal strength is greater than / ₃ less than or equal to / ₄ , the supported downlink control format is J or {1, 2} or J or {2, 4}; when the signal strength is greater than / ₄ , The supported downlink control format is J or {1, 2} or 7^ {1}. In the above five types of intervals, the base station further uses the one-bit high-level signaling to configure which supported downlink control signaling format is specifically used for the mobile relay. For example, when the signal strength is greater than / _{2 and} less than or equal to / ₃ , 1-bit high-level signaling: "0" stands for J or Ae{2, 4} _; "1" stands for J or Ae{4, 8}. Preferred Embodiment 6 This preferred embodiment 6 describes a procedure for configuring a supportable downlink control channel format for a mobile relay in a default manner in the case of a Doppler shift of a mobile relay and a plurality of decision thresholds. The base station presets three Doppler shift thresholds, from small to large: </ ₂ </ ₃ . The above three thresholds are divided into four types of interval ranges, and each of the interval ranges corresponds to only one supported downlink control signaling format by default. For example, when the Doppler shift of the mobile relay is less than or equal to; the downlink control format supported by the base station and the mobile relay by default is J or Ae{l, 2} _; when the Doppler shift of the mobile relay is greater than When less than or equal to / ₂ , the base station and mobile relay can support the downlink control format by default or {2, 4}; when the Doppler shift of the mobile relay is greater than / _{2 is} less than or equal to / ₃ , the base station and the mobile The default control format that can be supported by default is

J or Ae{4,8} _; when the Doppler shift of the mobile relay is greater than / ₃ , the downlink control format supported by the base station and the mobile relay by default is J or {16}. At this time, no high-level signaling is required for configuration. Preferred Embodiment 7 This preferred embodiment 7 describes a procedure in which a base station does not perform a decision operation and configures a unique supportable downlink control channel format. For a mobile relay with in-band/out-of-band and downlink control channel interleaved, its downlink control channel can only consist of L CCEs, and Je{l, 2, 4, 8} or Je{l, 2} or Je{2,4} or Je{4,8} or Je{4,8,16,32} or Je {4,8} or Je {8,16} or Je {16,32}, and stable. For in-band/out-of-band and downlink control channels using non-interleaved mobile relays, the downlink control channel can only consist of one RB pair, and Ae {1, 2, 4, 8} or Ae {1, 2 } or Ae {2,4} or Ae {4,8} or

One of Ae {4,8,16,32} or Ae {4,8} or Ae {8,16} or Ae {16,32}, and fixed. 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 device for configuring a downlink control channel format, and the device for configuring the downlink control channel format can be used to implement the configuration method of the downlink control channel format. FIG. 4 is a structural block diagram of a configuration apparatus for a downlink control channel format according to an embodiment of the present invention. As shown in FIG. 4, the first configuration module 42 and the second configuration module 44 are included, and the structure thereof will be described in detail below. The first configuration module 42 is configured to configure, by using high layer signaling, a downlink control channel format for the mobile terminal, where the downlink control channel format is one of {1, 2, 4, 8, 16, 32} CCEs or RB pairs One or more components; a second configuration module 44, configured to pre-configure a downlink control channel format for the mobile terminal. It should be noted that the configuration device of the downlink control channel format 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 foregoing embodiments of the present invention, a method and an apparatus for configuring a downlink control channel format are provided. With the present invention, the extended downlink control channel format is {1, 2, 4, 8, 16, 32}. The configuration of the downlink control channel format can be well applied to mobile relay (or a later version of the terminal), and the mobile relay is improved. The accuracy of receiving downlink control information on the Unlink reduces the bit error rate of data transmission, thereby improving the transmission efficiency of the entire communication system. It will be apparent to those skilled in the art that the various modules or steps of the present invention described above can be implemented by a general-purpose computing device that can be centralized on a single computing device or distributed across multiple computing devices. Optionally, 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 Implementing multiple modules or steps in them as 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 method for configuring a downlink control channel format, including:

The network side configures a downlink control channel format for the mobile terminal by using the high layer signaling, or the network side preconfigures the downlink control channel format for the mobile terminal, where the downlink control channel format is {1, 2, 4, 8, 16, 32 } The control channel element CCE or resource block is composed of one or more of RB pairs.

The method according to claim 1, wherein the configuring, by the network side, the downlink control channel format for the mobile terminal by using the high layer signaling includes:

The network side indicates, by the N-bit high-layer signaling, the mobile relay to configure the one or more downlink control channel formats, where N is the number of downlink control channel formats supported by the mobile relay, and the N Each bit in the high layer signaling of the bit is used to indicate one of the downlink control channel formats supported by the mobile relay.

The method according to claim 2, wherein before the network side configures the downlink control channel format for the mobile terminal by using the high layer signaling, the method further includes:

The network side acquires a decision parameter from the mobile terminal;

The network side compares the decision parameter with a preset decision threshold; the network side determines, according to the comparison result, a downlink control channel format for configuring the mobile terminal.

4. The method according to claim 3, wherein

Before the network side determines, according to the comparison result, the downlink control channel format used for configuring the mobile terminal, the method further includes: the network side and the mobile terminal are preset to be opposite to the determining threshold a combination of one or more downlink control channel formats, where the combination of each downlink control channel format includes one or more downlink control channel formats;

Determining, by the network side, the downlink control channel format for configuring the mobile terminal, according to the comparison result, the network side, according to the comparison result, combining the corresponding one or more downlink control channel formats Determining a combination of a downlink control channel format for configuring the mobile terminal; the network side instructing, by the M-bit high-layer signaling, the mobile terminal to select a combination of the determined downlink control channel formats, where M and The number of combinations of the downlink control channel formats corresponds.

The method according to claim 3, wherein the decision parameter comprises at least one of the following: a moving speed, a Doppler frequency offset, a channel quality, a bit error rate, and a signal strength.

The method according to claim 1, wherein the network side pre-configuring the downlink control channel format for the mobile terminal comprises: the network side pre-configuring the mobile terminal with a fixed downlink control channel format.

7. The method according to claim 6, wherein

Before the network side pre-configures the fixed downlink control channel format for the mobile terminal, the method further includes: the network side and the mobile terminal pre-setting one or more corresponding to the decision threshold Combination of downlink control channel formats, where each combination of downlink control channel formats includes one or more downlink control channel formats, and a combination of each downlink control channel format corresponds to one of the network side and the mobile terminal pre-configured Value

The network side pre-configuring the fixed downlink control channel format for the mobile terminal includes: determining, by the network side, a combination of the corresponding downlink control channel format according to the determined downlink control channel format; Instructing the mobile terminal to select a combination of the determined downlink control channel formats for configuration.

The method according to claim 7, wherein, in a case where the number of the decision thresholds is multiple, the network side and the mobile terminal preset a type corresponding to the decision threshold or A combination of multiple downlink control channel formats includes:

Determining a plurality of interval ranges formed by the plurality of decision thresholds;

A combination of downlink control channel formats corresponding to the plurality of interval ranges is respectively configured.

The method according to any one of claims 1 to 8, wherein the network side comprises one of: a base station e B, a relay node RN, a gateway GW, a mobility management entity MME, an evolved universal land Radio Access Network EUTRAN, Operations Management and Maintenance OAM Manager.

The method according to any one of claims 1 to 8, wherein the mobile terminal comprises one of the following: a mobile relay, a higher version of the user equipment.

11. A device for configuring a downlink control channel format, comprising:

a first configuration module, configured to configure a downlink control channel format for the mobile terminal by using high layer signaling, where the downlink control channel format is {1, 2, 4, 8, 16, 32} control channel unit CCE or resource block pair One or more components of the RB pair;

The second configuration module is configured to pre-configure a downlink control channel format for the mobile terminal.