CN102647254B

CN102647254B - Processing method, device and system for PDCCH (Physical Downlink Control Channel) in multi-carrier system

Info

Publication number: CN102647254B
Application number: CN201210101660.XA
Authority: CN
Inventors: 官磊; 曲秉玉; 余政; 薛丽霞
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2009-01-06
Filing date: 2009-01-06
Publication date: 2015-07-22
Anticipated expiration: 2029-01-06
Also published as: CN101772144A; CN102647254A; CN101772144B; WO2010078841A1

Abstract

The embodiment of the invention discloses a processing method, a processing device and a processing system for a PDCCH (Physical Downlink Control Channel) in a multi-carrier system, which can obtain good effects on the aspects of controlling signaling expenses, reducing the blind detection times of UE (User Equipment), reducing PDCCH loss state and the like. The method provided by the embodiment of the invention comprises the steps of distributing PDCCH of the UE onto all or part of downlink carriers corresponding to the uplink carriers of the UE according to the uplink carrier configuration information of the UE, selecting the uplink carriers of the UE corresponding to the downlink carriers distributed by the PDCCH through the UE so as to conduct ACK (Acknowledgement Character)/NACK (Negative Acknowledgement) feedback; and adopting combined encoding PDCCH with dynamic length according to the maximum parts of control information contained by the combined encoding PDCCH signaling of the UE, and conducting the blind detection of the combined encoding PDCCH signaling by the UE according to contained maximum parts of control information.

Description

Method, device and system for processing physical downlink control channel in multi-carrier system

Technical Field

The present invention relates to the field of wireless communication technologies, and in particular, to a method, an apparatus, and a system for processing a Physical Downlink Control Channel (PDCCH) in a multi-carrier system.

Background

In a long Term evolution lte (long Term evolution) system, a minimum time unit scheduled by a base station (eNB, Evolved NodeB) is one subframe, the length is one millisecond, and a scheduled terminal (UE) includes its own control channel in each subframe. The physical downlink control channel transmitted by the eNB includes two indication signaling, namely, a downlink scheduling grant (DL _ grant) and an uplink scheduling grant (UL _ grant). The PDCCH channels of all the UEs are shared in each downlink subframe, and the UEs utilize the specific scrambling codes thereof to carry out blind detection on any transmission possibility of the PDCCH in a set search space, wherein the blind detection comprises various possible PDCCH information lengths and occupied time-frequency resource positions. The search space is a continuous segment of resources defined according to a Control Channel Element (CCE), the UE performs PDCCH blind detection at some fixed locations therein, and the CCE is the minimum unit constituting the PDCCH, and according to the Channel condition, the UE can transmit by using four CCE levels (corresponding to different coding rates), i.e., 1, 2, 4, and 8. The search space sizes corresponding to these four CCE ranks are 6, 2, and 2, i.e., 6 blind detection possibilities for each of the 1 and 2CCE ranks and 2 blind detection possibilities for each of the 4 and 8CCE ranks. After the UE demodulates and decodes, it uses cyclic redundancy check crc (cyclic redundancy check) to check and determine its own control channel, and further uses the information therein to determine the transmission mode of data, modulation coding mode, occupied time-frequency position information, etc., to perform receiving detection of downlink data or sending of uplink data, and at the same time, the UE feeds back ACK/NACK response message corresponding to the UE on the corresponding uplink, and the process of repeatedly receiving and sending one data packet is called a hybrid adaptive request retransmission HARQ process. In the LTE system, one PDCCH of the UE can only carry one piece of control information, that is, corresponds to one HARQ process. The uplink ACK/NACK channel resource is reserved and mapped according to the position of the downlink control channel resource, namely, which DL _ grant is used for indicating the downlink data, and the ACK/NACK channel corresponding to which DL _ grant is used for the uplink data to feed back. If the eNB sends a DL _ grant to schedule the UE, but the UE does not detect its own DL _ grant, the UE will not feed back any information in uplink, and it is considered that the control signaling is lost.

The eNB sends at most one DL _ grant and one UL _ grant to one UE in one subframe, and the UE performs blind detection on the two control signaling respectively, i.e. traverses all current possible control signaling lengths. The UL _ grant has only one signaling length, the standard is specified as format0, i.e. format0, and the DL _ grant system is configured with seven modes, but only one of the modes can be selected for transmission at the same time, the DL _ grant of each mode includes two signaling lengths, one of the signaling lengths is always format 1A, i.e. format 1A, and the length of the signaling length is the same as that of format0 and is distinguished by 1 information bit in the signaling, and the other signaling length is determined according to the currently configured mode of the system. That is, in one subframe, the LTE UE needs to perform blind detection on PDCCHs with two signaling lengths to determine whether there is its DL _ grant or UL _ grant or both, one of the lengths is always format0 or 1A (because the two signaling lengths are the same), and the other is determined according to the system configuration mode.

In an evolved LTE system (LTE-a), wider bandwidth needs to be supported, and one possible way to support wider bandwidth is to aggregate multiple carriers, that is, resources of multiple carriers can be scheduled to one user for use at the same time to meet higher peak rate and service requirement. For LTE-a systems, PDCCH design due to the introduction of carrier aggregation is a considerable subject of research.

One solution is to notify the UE of the carriers occupied by the data channel through semi-static signaling, that is, to notify the UE of the carriers that need to be detected, and the UE always detects the several carriers that it notifies within the effective time of this semi-static signaling. The scheme has adverse effects on the reservation and mapping of uplink ACK/NACK feedback channel resources for asymmetric carrier aggregation. For example, under the condition of 4 downlink carriers and two uplink carriers, using the rule of the LTE system, the ACK/NACK channel resources on the two uplink carriers can only be reserved and mapped correspondingly through the control channels on the two downlink carriers corresponding to the ACK/NACK channel resources, and the uplink ACK/NACK feedback channel resources corresponding to the other two downlink carriers cannot be mapped easily.

Another scheme is that, in view of compatibility with the LTE system, the control signaling corresponding to each carrier is encoded separately, that is, each aggregated carrier is transmitted using a separate PDCCH, and the PDCCH mode and format on each aggregated carrier are consistent with those of the LTE system. Therefore, the LTE-a UE needs to perform blind detection on the PDCCH on each aggregation carrier like the LTE UE on the carrier, which makes the blind detection times increase linearly with the increase of the number of aggregation carriers; the increased number of PDCCHs also leads to a large number of states for distinguishing which PDCCH is lost, thereby being unfavorable for the feedback of uplink information; in addition, in terms of control signaling overhead, the PDCCH encoding schemes result in independent transmission of specific information indication bits in each PDCCH, which is not favorable for control signaling resource compression and optimization.

Disclosure of Invention

The embodiment of the invention provides a method, a device and a system for processing a physical downlink control channel in a multi-carrier system, which can achieve better effects in the aspects of controlling signaling overhead, reducing the number of times of blind tests of UE, reducing the loss state of a detection PDCCH and the like.

In order to achieve the above purpose, the embodiment of the invention is realized by the following technical scheme:

in one aspect, a method for allocating a physical downlink control channel PDCCH in a multi-carrier system is provided, including:

and distributing the PDCCH of the UE to all or part of downlink carriers corresponding to the uplink carriers of the UE according to the uplink carrier configuration of the UE.

A receiving method of a Physical Downlink Control Channel (PDCCH) in a multi-carrier system is provided, which comprises the following steps:

acquiring downlink carrier information of a PDCCH (physical downlink control channel);

and selecting an uplink carrier corresponding to the downlink carrier where the PDCCH is located to perform ACK/NACK feedback according to the acquired information.

Correspondingly, an apparatus for allocating a physical downlink control channel PDCCH in a multi-carrier system is provided, which includes:

and the carrier allocation unit is used for allocating the PDCCH of the UE to all or part of downlink carriers corresponding to the uplink carriers of the UE according to the uplink carrier configuration of the UE.

Also provided is a receiving device of a physical downlink control channel PDCCH in a multi-carrier system, comprising:

a carrier information obtaining unit, configured to obtain downlink carrier information where the PDCCH is located;

and the feedback channel selection unit is used for selecting the uplink carrier corresponding to the downlink carrier where the PDCCH is located to perform ACK/NACK feedback according to the information acquired by the carrier information acquisition unit.

In another aspect, a method for coding a physical downlink control channel PDCCH in a multi-carrier system is provided, including:

according to the maximum control information contained in the joint coding PDCCH signaling of the user equipment UE, adopting a dynamic length joint coding PDCCH; each piece of control information corresponds to a hybrid adaptive request retransmission HARQ process, and may be a downlink scheduling grant DL _ grant or an uplink scheduling grant UL _ grant.

A method for detecting a Physical Downlink Control Channel (PDCCH) in a multi-carrier system is provided, which comprises the following steps:

acquiring the most control information contained in the joint coding PDCCH signaling;

and carrying out blind detection on the joint coding PDCCH signaling according to the acquired most control information.

Correspondingly, an encoding device for a physical downlink control channel PDCCH in a multi-carrier system is provided, which includes:

the coding unit is used for adopting the dynamic length joint coding PDCCH according to the most control information contained in the joint coding PDCCH signaling of the user equipment UE; each piece of control information corresponds to a hybrid adaptive request retransmission HARQ process, and may be a downlink scheduling grant DL _ grant or an uplink scheduling grant UL _ grant.

Also provided is a detection device for a physical downlink control channel PDCCH in a multi-carrier system, comprising:

a control information obtaining unit, configured to obtain the most control information included in the joint coding PDCCH signaling;

and the blind detection unit is used for carrying out blind detection on the joint coding PDCCH signaling according to the acquired most control information.

According to the technical scheme provided by the embodiment of the invention, on one hand, the PDCCH of the UE is distributed to all or part of downlink carriers corresponding to the uplink carriers of the UE according to the uplink carrier configuration of the UE, and the uplink carrier corresponding to the downlink carrier where the PDCCH is located is selected by the UE to perform ACK/NACK feedback; on the other hand, according to the most control information contained in the joint coding PDCCH signaling of the UE, the dynamic length joint coding PDCCH is adopted, and the UE performs blind detection on the joint coding PDCCH signaling according to the most control information, so that the distributed PDCCH or the joint coding PDCCH can obtain better effects in the aspects of controlling signaling overhead, reducing the blind detection times of the UE, reducing the detection PDCCH loss state and the like.

Drawings

Fig. 1 is a flowchart illustrating a method for allocating a physical downlink control channel PDCCH in a multi-carrier system according to an embodiment of the present invention;

fig. 2 is a flowchart illustrating a method for receiving a physical downlink control channel PDCCH in a multi-carrier system according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of an allocation apparatus for a physical downlink control channel PDCCH in a multi-carrier system according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a receiving apparatus of a physical downlink control channel PDCCH in a multi-carrier system according to an embodiment of the present invention;

fig. 5 is a flowchart illustrating a method for coding a physical downlink control channel PDCCH in a multi-carrier system according to an embodiment of the present invention;

fig. 6 is a flowchart illustrating a method for detecting a physical downlink control channel PDCCH in a multi-carrier system according to an embodiment of the present invention;

fig. 7 is a schematic diagram of an aggregate of a dynamic length joint coding PDCCH according to an embodiment of the present invention;

fig. 8 is a schematic diagram of an aggregate of a dynamic length joint coding PDCCH according to an embodiment of the present invention;

fig. 9 is a schematic diagram illustrating a method for jointly encoding a PDCCH under different control information according to an embodiment of the present invention;

fig. 10 is a schematic diagram illustrating the signaling length required to be blindly detected under the parity number control information provided in the embodiment of the present invention;

fig. 11 is a schematic structural diagram of an encoding apparatus of a physical downlink control channel PDCCH in a multi-carrier system according to an embodiment of the present invention;

fig. 12 is a schematic structural diagram of an encoding apparatus of a physical downlink control channel PDCCH in another multi-carrier system according to an embodiment of the present invention;

fig. 13 is a schematic structural diagram of a detection apparatus for a PDCCH in a multi-carrier system according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions provided by the present invention are further described in detail below by referring to the accompanying drawings and embodiments.

Referring to fig. 1, a method for allocating a physical downlink control channel PDCCH in a multi-carrier system according to an embodiment of the present invention includes:

and step 11, the base station allocates the PDCCH of the UE to all or part of downlink carriers corresponding to the uplink carriers of the UE according to the uplink carrier configuration of the UE.

Due to the limitation of the transmitting capability of the UE, the number of uplink carriers of the UE is less than that of downlink carriers, and the PDCCH is allocated according to the uplink carrier configuration of the UE in all the schemes. The downlink carrier allocated to the PDCCH may be one or more downlink carriers corresponding to the uplink carrier of the UE, and the number of carriers occupied by the data channel is not more than the number of carriers occupied by the data channel.

The base station may notify the UE of the downlink carrier allocated by the PDCCH of the UE in a semi-static signaling notification manner. Since the uplink ACK/NACK channel resources are allocated according to the position of the PDCCH, the reservation and mapping of the uplink ACK/NACK feedback channel resources are facilitated. And the UE selects an uplink carrier corresponding to the downlink carrier where the PDCCH is located to perform ACK/NACK feedback according to the notified information.

Specifically, when the PDCCH of the UE is allocated to a downlink carrier for transmission, the uplink ACK/NACK feedback of the UE occurs on the uplink carrier corresponding to the downlink carrier; when the PDCCH of the UE is allocated to a plurality of downlink carriers for transmission, the uplink ACK/NACK feedback of the UE occurs on the uplink carriers corresponding to the several downlink carriers. Since the uplink ACK/NACK channel resources are allocated according to the position of the PDCCH, the reservation and mapping of the uplink ACK/NACK feedback channel resources are facilitated.

After the PDCCH of the UE is allocated to the downlink carrier, the allocation method provided in the embodiment of the present invention further includes:

and step 12, the base station allocates a PDCCH search space for each downlink carrier of the UE according to the number of PDCCHs allocated to each downlink carrier of the UE and the Control Channel Element (CCE) level of the PDCCHs.

In this step, a semi-static signaling notification mode may also be adopted to notify the UE of the PDCCH search space allocated to each downlink carrier of the UE, and the UE performs PDCCH blind detection according to the PDCCH search space allocated to each downlink carrier.

For N separately coded PDCCHs of N aggregated carriers, their respective search spaces are independent if placed on N carriers for transmission, assuming that the separately coded PDCCHs have a search space size of P1, P2, P4, or P8, the total resource size is N × P1, N × P2, N × P4, or N × P8; for the N separately coded PDCCHs of the N aggregated carriers, if the technical solution provided by the embodiment of the present invention is adopted, the separately coded or jointly coded PDCCHs are placed on a certain semi-statically notified carrier for transmission, and at this time, the search space may be reduced by some due to some flexibility of placement. For example, if the number of PDCCHs allocated to each downlink carrier is n and the predetermined search space size of each PDCCH is m, that is, the aforementioned P1, P2, P4, or P8, then the PDCCH search space actually allocated to each downlink carrier of the UE may be smaller than n × m. Specifically, an integer that makes the following expression true may be taken:

<math> <mrow> <mo>{</mo> <msub> <mi>Q</mi> <mi>i</mi> </msub> <mo>|</mo> <msubsup> <mi>C</mi> <msub> <mi>Q</mi> <mi>i</mi> </msub> <mi>N</mi> </msubsup> <mo>&GreaterEqual;</mo> <msup> <msub> <mi>P</mi> <mi>i</mi> </msub> <mi>N</mi> </msup> <mo>}</mo> <mo>≤</mo> <msub> <mi>Q</mi> <mi>i</mi> </msub> <mo>≤</mo> <mi>N</mi> <mo>*</mo> <msub> <mi>P</mi> <mi>i</mi> </msub> <mo>,</mo> </mrow> </math>

wherein

C_{a}^{b} = \frac{a * (a - 1) * . . . * b}{b * (b - 1) * . . . * 1} .

Since the size of the PDCCH search space on each carrier may be determined according to the number of PDCCHs and CCE levels transmitted on each downlink carrier, and compared to a scheme in which a plurality of PDCCHs are transmitted on respective data carriers, the search space may be linearly increased with respect to an increase in the number of PDCCHs or smaller than the linearly increased search space size. This enables the UE to perform blind detection of PDCCH signaling in the search space of the PDCCH less frequently.

Corresponding to the PDCCH allocation method in the multi-carrier system provided in the embodiment of the present invention, the embodiment of the present invention further provides a method for receiving a physical downlink control channel PDCCH in the multi-carrier system, which, referring to fig. 2, includes:

and step 21, acquiring the downlink carrier information of the PDCCH.

The method for acquiring the downlink carrier information of the PDCCH in the step comprises the following steps:

acquiring in a manner of receiving a semi-static signaling notification; or, the acquisition is performed according to the uplink carrier configuration of the user equipment UE.

And step 22, selecting an uplink carrier corresponding to the downlink carrier where the PDCCH is located to perform ACK/NACK feedback according to the acquired information. And the number of the first and second groups,

and step 23, acquiring a PDCCH search space of each downlink carrier where the PDCCH is located.

In this step, a PDCCH search space of each downlink carrier where the PDCCH is located may also be obtained by receiving a semi-static signaling notification.

And 24, performing PDCCH blind detection on each downlink carrier according to the PDCCH search space.

According to the method for allocating and receiving the PDCCH in the multi-carrier system, the PDCCH of the UE is allocated to all or part of downlink carriers corresponding to the uplink carriers of the UE according to the uplink carrier configuration of the UE, and the UE performs ACK/NACK feedback on the uplink carriers corresponding to the downlink carriers allocated by the PDCCH, so that signaling overhead can be controlled favorably, and the PDCCH loss detection state is reduced; and allocating a PDCCH search space for each downlink carrier of the UE according to the number of PDCCHs allocated to each downlink carrier of the UE and the CCE grade of the PDCCHs, so that the frequency of PDCCH signaling blind detection of the UE in the search space of the PDCCH is reduced. Therefore, the allocation and reception method provided by the embodiment of the invention can enable the allocated PDCCH to obtain better effects in the aspects of controlling signaling overhead, reducing the number of blind detection times of UE, reducing the detection PDCCH loss state and the like.

Referring to fig. 3, an embodiment of the present invention provides an allocation apparatus for a physical downlink control channel PDCCH in a multi-carrier system, where the allocation apparatus is configured to allocate the PDCCH of a user equipment UE to all or part of downlink carriers corresponding to an uplink carrier of the UE according to uplink carrier configuration of the UE.

Specifically, the distribution device includes:

a carrier allocation unit 31, configured to allocate, according to an uplink carrier configuration of a UE, a PDCCH of the UE to all or part of downlink carriers corresponding to the uplink carrier of the UE.

According to the allocation result of the carrier allocation unit 31, the allocation apparatus provided in the embodiment of the present invention further includes:

a search space allocation unit 32, configured to allocate a PDCCH search space for each downlink carrier of the UE according to the number of PDCCHs allocated to each downlink carrier of the UE and the CCE level of the PDCCHs.

An embodiment is that, the distribution apparatus provided in the embodiment of the present invention further includes:

a notifying unit 33, configured to notify, in a semi-static signaling notification manner, the UE of the downlink carrier allocated by the carrier allocating unit 31 for the PDCCH of the UE or the PDCCH search space allocated by the search space allocating unit 32 for each downlink carrier of the UE.

Since the uplink ACK/NACK channel resources are allocated according to the position of the PDCCH, the reservation and mapping of the uplink ACK/NACK feedback channel resources are facilitated. And the UE selects an uplink carrier corresponding to the downlink carrier where the PDCCH is located to perform ACK/NACK feedback according to the notified information.

Moreover, since the size of the PDCCH search space on each carrier may be determined according to the number of PDCCHs and CCE levels transmitted on each downlink carrier, and compared to a scheme in which a plurality of PDCCHs are transmitted on respective data carriers, the search space may be linearly increased with respect to an increase in the number of PDCCHs or smaller than the linearly increased search space size. This reduces the number of times the UE performs blind PDCCH signaling detection within the search space of the PDCCH.

Corresponding to the apparatus for allocating PDCCH in a multi-carrier system provided in the embodiment of the present invention, an embodiment of the present invention further provides a apparatus for receiving a physical downlink control channel PDCCH in a multi-carrier system, where, referring to fig. 4, the apparatus includes:

a carrier information acquiring unit 41, configured to acquire downlink carrier information where the PDCCH is located.

The method for acquiring the downlink carrier information of the PDCCH comprises the following steps: acquiring in a manner of receiving a semi-static signaling notification; or, the acquisition is performed according to the uplink carrier configuration of the user equipment UE.

And a feedback channel selecting unit 42, configured to select, according to the information acquired by the carrier information acquiring unit 41, an uplink carrier corresponding to the downlink carrier where the PDCCH is located to perform ACK/NACK feedback.

The distribution method provided by the embodiment of the invention also comprises the following steps:

a search space acquiring unit 43 is configured to acquire a PDCCH search space for each downlink carrier where a PDCCH is located.

The method for acquiring the PDCCH search space of each downlink carrier in which the PDCCH is positioned comprises the step of acquiring in a mode of receiving semi-static signaling notification.

And a blind detection unit 44, configured to perform PDCCH blind detection on each downlink carrier according to the PDCCH search space acquired by the search space acquisition unit 43.

In an embodiment, the receiving apparatus provided in the embodiment of the present invention further includes a notification receiving unit 40, configured to receive a semi-static signaling notification, and obtain, according to the notification, downlink carrier information allocated by the PDCCH or a PDCCH search space allocated by the downlink carrier.

According to the device for allocating and receiving the PDCCH in the multi-carrier system, the PDCCH of the UE is allocated to all or part of downlink carriers corresponding to the uplink carriers of the UE through the carrier allocation unit 31 according to the uplink carrier configuration of the UE, and the UE performs ACK/NACK feedback on the uplink carriers corresponding to the downlink carriers allocated by the PDCCH, so that the signaling overhead can be favorably controlled, and the PDCCH loss detection state can be reduced; and the search space allocation unit 32 allocates a PDCCH search space for each downlink carrier of the UE according to the number of PDCCHs allocated to each downlink carrier of the UE and the control channel element CCE level of the PDCCH, so that the number of times that the UE performs PDCCH signaling blind detection in the search space of the PDCCH is reduced. Therefore, the allocation and receiving device provided by the embodiment of the invention can enable the allocated PDCCH to obtain better effects in the aspects of controlling signaling overhead, reducing the blind detection times of UE, reducing the detection PDCCH loss state and the like.

Referring to fig. 5, an embodiment of the present invention provides a method for encoding a physical downlink control channel PDCCH in a multi-carrier system, including:

step 51, according to the most control information contained in the joint coding PDCCH signaling of the user equipment UE, adopting a dynamic length joint coding PDCCH; each piece of control information corresponds to one hybrid adaptive request retransmission HARQ process, and may be one DL _ grant or one UL _ grant.

In this step, the DL _ grant or UL _ grant is preferably jointly encoded; and secondly, when the DL _ grant and the UL _ grant are respectively subjected to joint coding and have residues, carrying out joint coding on the residual DL _ grant and the residual UL _ grant. And when the total length of the joint coding PDCCH signaling is the same but control information with different lengths exists in the sequence, adding head bit information in the PDCCH signaling for indicating and distinguishing. By specifying that DL _ grant and UL _ grant can be jointly coded, a certain flexibility can be provided for jointly coding PDCCH, and system control signaling overhead can be reduced.

And step 52, notifying most control information contained in the joint coding PDCCH signaling of the UE to the UE by adopting semi-static signaling.

Corresponding to the coding method provided in the embodiment of the present invention, an embodiment of the present invention further provides a method for detecting a physical downlink control channel PDCCH in a multi-carrier system, where, referring to fig. 6, the method includes:

and step 61, acquiring the most control information contained in the joint coding PDCCH signaling.

The method for acquiring the most control information contained in the joint coding PDCCH signaling comprises the step of acquiring by receiving a semi-static signaling notification.

And step 62, performing blind detection on the joint coding PDCCH signaling according to the acquired most control information.

For LTE-a system, UL _ grant may include multiple signaling lengths, i.e. not only one length of format0, but also similar to DL _ grant, the system configures multiple modes for UL _ grant and can use only one at a time, and the signaling length of UL _ grant used is similar to the signaling length of format0 and format 1A in LTE system, and the same signaling length as DL _ grant is used to reduce UE blind detection.

For LTE-a systems, the same or different DL _ grant and UL _ grant patterns are employed per aggregated carrier. For the former, LTE-a UE shall detect two DL _ grant control signaling lengths, denoted as L1 and L2, respectively, according to configured DL _ grant mode in one subframe, where L2 is the control signaling length in the current UL _ grant mode, so that a method similar to the same signaling length of UL _ grant format0 and DL _ grant format 1A in LTE system is adopted; for the latter, since the mode of aggregated carriers may be different, the combined signaling length may be more, for example, two carriers are aggregated, one of which may have DL _ grant signaling lengths of L1 and L2, the other may have DL _ grant signaling lengths of L3 and L2, and the UL _ grant signaling length of L2.

The method for coding and detecting the PDCCH in the multi-carrier system provided by the embodiment of the invention adopts a joint coding mode, joint coding PDCCH signals with various lengths are dynamically combined according to the number of aggregation carriers and different control signaling lengths of each aggregation carrier, the joint coding PDCCH signals with the dynamic lengths are adopted according to the maximum control information contained in the joint coding PDCCH signals of the UE, the UE is informed of the maximum control information contained in the joint coding PDCCH signals by adopting semi-static signaling, and the UE carries out blind detection on the joint coding PDCCH signals under the informing information, so that the joint coding PDCCH can obtain better effects in the aspects of controlling signaling overhead, reducing UE blind detection times, reducing the PDCCH loss state and the like.

In one embodiment, the PDCCH is fixedly coded with the most control information in a dynamic length joint way; and zero padding is carried out on the spare information appearing in the joint coding PDCCH by adopting a head part or a tail part. Thus, the UE can confirm that the part of bits is free information when detecting the PDCCH.

Under the above restriction information, for aggregated carriers with the same mode, two lengths to be detected for each carrier are L1 and L2, so:

referring to fig. 7, for the maximum amount of control information, 2, the set of dynamic length PDCCHs includes three combinations of L1L1, L2L2, and L1L2 (since the jointly coded PDCCHs may be subjected to a certain degree of control signaling bit compression and optimization, the signaling length is not necessarily equal to L1+ L1, L2+ L2, and L1+ L2, but is relevant, and the same below), while L2L1 and L1L2 have the same length but different lengths of control information in sequence, and may be indicated by adding header bit information inside PDCCH signaling.

Referring to fig. 8, for the maximum amount of control information, 3, the set of dynamic length PDCCHs includes L1L1, L2L2, L1L2, and L1L2L2, while L1L2L1 and L2L1L1 are the same in length but in different order as L1L2, and L2L1L2 and L2L1 are the same in length but in different order as L1L2L2, and indication distinction can be made by adding header bit information inside PDCCH signaling.

In order to reduce the detection of the PDCCH loss state, the DL _ grant and the UL _ grant are preferably jointly coded respectively; and secondly, when the DL _ grant and the UL _ grant are respectively subjected to joint coding and have residues, carrying out joint coding on the residual DL _ grant and the residual UL _ grant. Therefore, extra blind detection times and control signaling overhead are not introduced, certain flexibility is provided for the respective coding of the DL _ grant and the UL _ grant, and the control signaling overhead can be reduced in some cases. The following is illustrated by taking N ═ 2 as an example:

referring to fig. 9, fig. 9 shows a PDCCH joint coding method in several cases, including 2 DL _ grants and 2 UL _ grants, 2 DL _ grants and 1 UL _ grant, 1 DL _ grant and 2 UL _ grants, 1 DL _ grant and 1 UL _ grant, 3 DL _ grants and 1 UL _ grant. As can be seen from fig. 9, when the case (d) (e) occurs, the DL _ grant and UL _ grant joint coding reduces control signaling overhead compared to separate coding.

In one embodiment, the PDCCH is dynamically length jointly coded with a code containing 1, 2, … or the most control information.

Under the restriction information, considering that the PDCCH has a large signaling length, a restriction condition may be added to the length set of the jointly coded PDCCH to restrict certain combinations from occurring, and this restriction condition may be notified by a semi-static signaling, or may be determined according to the maximum amount of control information and a rule predefined by a standard. The two lengths L1 and L2 that each carrier needs to detect are also exemplified for the aggregated carriers with the same mode:

for the maximum of 2 control information, all combinations of the dynamic length joint coded PDCCH include L1, L2, L1L1, L2L2, and L1L 2. For the PDCCHs with the same length and different control information in sequence, header bit information can be added in the PDCCH signaling for indicating and distinguishing. The restriction conditions that the formats of the added aggregation carriers are the same, namely the restriction of L1L2 combination does not occur; or adding a limiting condition that the aggregation carrier combination at least comprises control information with the length of L2, namely limiting the combination of L1 and L1L1 not to occur, so that the joint coding of DL _ grant and UL _ grant can be more favorably realized; of course, other ways of limiting are equally possible and the invention is not limited.

For the maximum control information of 3, all combinations of the dynamic length joint coded PDCCH include L1, L2, L1L1, L2L2, L1L2, L1L1, L2L2, L1L2 and L1L2L2, and for the PDCCH having the same length as L1L2 or L1L2L2 but different lengths of control information in sequence, the PDCCH signaling may be indicated and distinguished by adding header bit information inside the PDCCH signaling. The restriction conditions that the formats of the added aggregation carriers are the same, namely, the combination of L1L2, L1L2 and L1L2L2 cannot occur; or the limitation condition that at least one control information with the length of L2 is contained in the added aggregation carrier combination, namely, the combination of L1, L1L1 and L1L1L1 does not appear. This may be more advantageous for DL _ grant and UL _ grant joint coding; of course, other ways of limiting are equally possible and the invention is not limited.

In order to reduce the detection of the PDCCH loss state, the DL _ grant and the UL _ grant are preferably jointly coded respectively; and secondly, when the DL _ grant and the UL _ grant are respectively subjected to joint coding and have residues, carrying out joint coding on the residual DL _ grant and the residual UL _ grant. Therefore, extra blind detection times and control signaling overhead are not introduced, certain flexibility is provided for the respective coding of the DL _ grant and the UL _ grant, and the control signaling overhead can be reduced in some cases.

In one embodiment, the PDCCH is dynamically length jointly coded with control information containing at most 2 copies. All combinations of the jointly encoded PDCCHs of the present embodiment are L1, L2, L1L1, L2L2, and L1L2, and for L2L1 having the same length as L1L2 but different lengths of control information in sequence, a manner of adding header bit information inside the PDCCH signaling for indication and distinction is still adopted. This embodiment does not need to introduce additional restriction information to restrict the set of lengths of the jointly coded PDCCH. And when the control signaling is more, the blind detection times and the overhead of the control signaling can be greatly reduced.

In this embodiment, the number of blind detection times of the UE may also be reduced according to the parity of the total number of the control signaling, and when the total number of the control signaling (including DL _ grant and UL _ grant) is an odd number, the five signaling lengths all need blind detection; when the total number of the control signaling is even, only three control signaling lengths of L1L1, L2L2 and L1L2 need to be detected blindly. Referring to fig. 10, when a scheduled UE has 5 DL _ grants and 2 UL _ grants, the transmission scheme is as shown in fig. 10(a), when each signaling length of L1, L2, L1L1, L2L2, or L1L2 needs to be blindly detected; when the scheduled UE has 5 DL _ grants and 1 UL _ grant, the transmission scheme is as shown in fig. 10(b), and only three control signaling lengths L1L1, L2L2, and L1L2 need to be detected blindly at this time.

It should be noted that, the embodiments of the present invention are all described under the assumption that the aggregated carrier modes are the same, and for the cases of different aggregated carrier modes, there are many PDCCH signaling length combinations, which can be implemented by using the restriction information similar to the above.

Referring to fig. 11, an embodiment of the present invention provides a coding apparatus for a physical downlink control channel PDCCH in a multi-carrier system, where the coding apparatus is configured to jointly code a PDCCH with a dynamic length according to most control information included in a joint coded PDCCH signaling of a user equipment UE; each piece of control information corresponds to a hybrid adaptive request retransmission (HARQ) process, and each piece of control information is a downlink scheduling grant (DL _ grant) or an uplink scheduling grant (UL _ grant).

Specifically, the encoding apparatus may include:

an encoding unit 110, configured to jointly encode a PDCCH with a dynamic length according to a maximum amount of control information included in a joint encoded PDCCH signaling of a user equipment UE; each piece of control information corresponds to a hybrid adaptive request retransmission HARQ process, and may be a downlink scheduling grant DL _ grant or an uplink scheduling grant UL _ grant.

The encoding unit 110 is specifically configured to perform joint encoding on DL _ grant or UL _ grant of the UE respectively; and when the DL _ grant and the UL _ grant are respectively jointly encoded and have a residue, jointly encoding the remaining DL _ grant and the remaining UL _ grant. By specifying that DL _ grant and UL _ grant can be jointly coded, a certain flexibility can be provided for jointly coding PDCCH, and system control signaling overhead can be reduced.

Moreover, when the total lengths of the jointly coded PDCCH signaling are the same but control information with different lengths exists in sequence, the coding unit 110 is further specifically configured to add header bit information to perform indication differentiation in the PDCCH signaling.

In one embodiment, still referring to fig. 11, the encoding unit 110 includes:

a first coding module 111, configured to perform fixed dynamic length joint coding on the PDCCH with the most control information; and a zero padding module 112, configured to perform zero padding on the spare information appearing in the jointly encoded PDCCH by using a header or a trailer.

In one embodiment, referring to fig. 12, the encoding unit 110 includes:

a second coding module 115, configured to perform dynamic length joint coding on the PDCCH with the control information including 1, 2, … or the most control information.

In view of the fact that the signaling length of the PDCCH is large, a restriction condition may be added to the length set of the jointly coded PDCCH to restrict certain combinations from occurring, and this restriction condition may be notified by a semi-static signaling, or may be determined according to a rule predefined by the maximum amount of control information and a standard. Therefore, the embodiment may further include a limiting module 116, configured to limit the additional limiting condition for the length set of the jointly coded PDCCH. The limitation condition includes that formats of aggregated carriers of the jointly coded PDCCH are the same, or a combination of the aggregated carriers of the jointly coded PDCCH at least contains control information with a certain length.

The coding device of the PDCCH in the multi-carrier system provided by the embodiment of the invention adopts a joint coding mode to dynamically combine joint coding PDCCHs with various signaling lengths according to the number of the aggregation carriers and different control signaling lengths of each aggregation carrier, and adopts the joint coding PDCCH with the dynamic length according to the maximum control information contained in the joint coding PDCCH signaling of the UE through the coding unit 110, so that the joint coding PDCCH can obtain better effects in the aspects of controlling signaling overhead, reducing the number of blind tests of the UE, reducing the lost state of the detected PDCCH and the like.

Referring to fig. 13, an embodiment of the present invention further provides a device for detecting a physical downlink control channel PDCCH in a multi-carrier system, where the device includes:

a control information obtaining unit 131, configured to obtain the most control information included in the jointly coded PDCCH signaling.

And a blind detection unit 132, configured to perform blind detection on the jointly coded PDCCH signaling according to the obtained most control information.

In addition, the detection apparatus provided in the embodiment of the present invention further includes a notification receiving unit 130, configured to receive a semi-static signaling notification, and obtain, according to the notification, the most control information included in the joint coded PDCCH signaling.

In view of the fact that the signaling length of the PDCCH is large, a restriction condition may be added to the length set of the jointly coded PDCCH to restrict certain combinations from occurring, and this restriction condition may be notified by a semi-static signaling, or may be determined according to a rule predefined by the maximum amount of control information and a standard. Therefore, the base station 101 is further configured to add a limitation condition to the length set of the jointly coded PDCCH signaling.

According to the detection device of the PDCCH in the multi-carrier system provided by the embodiment of the invention, the control information acquisition unit 131 is used for acquiring the most control information contained in the joint coding PDCCH signaling of the UE, and the blind detection unit 132 is used for carrying out blind detection on the joint coding PDCCH signaling according to the acquired most control information, so that better effects can be achieved in the aspects of controlling signaling overhead, reducing the blind detection times of the UE, reducing the loss state of the detected PDCCH and the like.

It should be noted that the method in the embodiment of the present invention may be implemented in the form of a software functional module, and the software functional module may also be stored in a computer readable storage medium when the software functional module is sold or used as a stand-alone product. Each functional unit in the embodiments of the present invention may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium. The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc.

The foregoing describes in detail a method, an apparatus, and a system for processing a physical downlink control channel in a multi-carrier system according to an embodiment of the present invention, and the description of the embodiment is only used to help understanding the method and the idea of the present invention; any person skilled in the art can easily conceive of changes or substitutions within the technical scope of the present disclosure, and all such changes or substitutions are included in the scope of the present disclosure.

Claims

1. A coding method of a Physical Downlink Control Channel (PDCCH) in a multi-carrier system is characterized by comprising the following steps:

according to the maximum control information contained in the joint coding PDCCH signaling of the user equipment UE, adopting a dynamic length joint coding PDCCH; each piece of control information corresponds to a hybrid adaptive request retransmission (HARQ) process, and each piece of control information is a downlink scheduling grant (DL _ grant) or an uplink scheduling grant (UL _ grant);

wherein the encoding method further comprises:

and adding a limiting condition to the length set of the joint coding PDCCH signaling for limiting.

2. The coding method according to claim 1, wherein the method for jointly coding PDCCH with dynamic length comprises:

respectively carrying out joint coding on DL _ grant or UL _ grant of the UE;

and when the DL _ grant and the UL _ grant are respectively subjected to joint coding and have residues, carrying out joint coding on the residual DL _ grant and the residual UL _ grant.

3. The coding method according to claim 2, wherein the method for jointly coding PDCCH with dynamic length further comprises:

when the total lengths of the joint coding PDCCH signaling are the same but control information with different lengths exists in the sequence, adding head bit information in the PDCCH signaling for indicating and distinguishing.

4. The encoding method of claim 1, further comprising:

fixing the PDCCH which is subjected to dynamic length joint coding by the most control information;

and zero padding is carried out on the spare information appearing in the joint coding PDCCH signaling by adopting a head part or a tail part.

5. The encoding method of claim 1, further comprising:

and performing dynamic length joint coding (PDCCH) by using the PDCCH containing 1, 2, … or the most control information.

6. The encoding method according to claim 5, wherein the added constraint condition includes:

the formats of the aggregated carriers of the joint coding PDCCH are the same; or,

the combination of aggregated carriers of the jointly coded PDCCH includes at least control information of a certain length.

7. The encoding method of claim 1, further comprising:

and notifying the UE of the most control information contained in the joint coding PDCCH signaling of the UE by adopting a semi-static signaling notification mode.

8. An encoding apparatus for a Physical Downlink Control Channel (PDCCH) in a multi-carrier system, comprising:

the coding unit is used for adopting the dynamic length joint coding PDCCH according to the most control information contained in the joint coding PDCCH signaling of the user equipment UE; each piece of control information corresponds to a hybrid adaptive request retransmission (HARQ) process, and each piece of control information is a downlink scheduling grant (DL _ grant) or an uplink scheduling grant (UL _ grant);

wherein the encoding unit further includes:

and the limiting module is used for limiting the length set of the joint coding PDCCH signaling by adding a limiting condition.

9. The encoding apparatus as claimed in claim 8, wherein the coding unit is specifically configured to jointly encode a DL _ grant or a UL _ grant of the UE, respectively; and when the DL _ grant and the UL _ grant are respectively jointly encoded and have a residue, jointly encoding the remaining DL _ grant and the remaining UL _ grant.

10. The coding apparatus according to claim 9, wherein the coding unit is further configured to add header bit information for indication differentiation within the PDCCH signaling when the total length of the jointly coded PDCCH signaling is the same but there are control information with different lengths in the sequence.

11. The encoding device according to claim 10, wherein the encoding unit includes:

the first coding module is used for fixedly carrying out dynamic length joint coding on the PDCCH by using the most control information; and,

and the zero padding module is used for padding the spare information in the joint coding PDCCH signaling by adopting a head part or a tail part.

12. The encoding device according to claim 10, wherein the encoding unit includes:

and a second coding module, configured to perform dynamic length joint coding on the PDCCH with the control information including 1, 2, … or the most control information.

13. A multi-carrier system is characterized in that the system comprises a coding device of a Physical Downlink Control Channel (PDCCH), wherein the coding device is used for adopting a dynamic length joint coding PDCCH according to the most control information contained in a joint coding PDCCH signaling of User Equipment (UE); each piece of control information corresponds to a hybrid adaptive request retransmission (HARQ) process, and each piece of control information is a downlink scheduling grant (DL _ grant) or an uplink scheduling grant (UL _ grant);

the coding device is also used for limiting the length set adding limitation condition of the joint coding PDCCH signaling.