CN101729217A - Method, device and system for transmission - Google Patents
Method, device and system for transmission Download PDFInfo
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- CN101729217A CN101729217A CN200810174678A CN200810174678A CN101729217A CN 101729217 A CN101729217 A CN 101729217A CN 200810174678 A CN200810174678 A CN 200810174678A CN 200810174678 A CN200810174678 A CN 200810174678A CN 101729217 A CN101729217 A CN 101729217A
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Abstract
The embodiment of the invention discloses a transmission method, a transmission device and a transmission system. The method comprises the following steps of: according to terminal capability, determining physical uplink control channel resource distributed by a terminal, wherein the terminal capability comprises one or more of the number of radio frequency chains configured on the terminal, the number of antennas configured on the terminal and limited situations of the terminal; and determining the transmission mode of a physical uplink control channel according to the physical uplink control channel resource distributed by the terminal, and a control signaling type and channel quality needing to be fed back; and feeding back the physical uplink control channel according to the transmission mode of the physical uplink control channel. The method, the device and the system disclosed by the embodiment of the invention realize the sufficient utilization of the new capability of the terminal in an LTE-A system, and flexibly select the transmission mode of the PUCCH (physical uplink control channel). Through the method, the device and the system disclosed by the embodiment of the invention, each terminal can make use of the own advantages better, or acquire more control channel resources so as to feed back more control information, or improve system performance and enhance the edge coverage of a cell.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a transmission method, apparatus, and system.
Background
Future wireless communication systems have higher and higher requirements for data rate, which not only requires improvement of spectrum efficiency, but also requires a substantial increase of transmission bandwidth. For example, peak rates of an LTE (Long Term Evolution) -a system are respectively targeted to downlink 1Gbps and uplink 500 Mbps.
To achieve this, LTE-a systems will support transmission bandwidths larger than 20MHz (even up to 100MHz), implemented by carrier aggregation, i.e. aggregating two or more element carriers. In order for the LTE-a system to maintain backward compatibility, the LTE-a control channel design must consider the inherent structure of the LTE system. In the LTE system, a PUCCH (Physical Uplink Control Channel) transmits 3 types of Uplink Control information: SRI (Scheduling Request Indicator), ACK (Acknowledgement)/NACK (Non-Acknowledgement), and CQI (Channel Quality Indicator). The PUCCH is transmitted on both sides of the frequency band by inter-slot frequency hopping. The PUCCH has 6 formats as shown in table 1, and is used to transmit different uplink control information.
Table 1 formats supported by PUCCH
| PUCCH format | Modulation system | Number of bits per subframe (Mbit) | Content of transmission |
| 1 | N/A | N/A | SRI |
| 1a | BPSK | 1 | ACK/NACK |
| 1b | QPSK | 2 | ACK/NACK |
| 2 | QPSK | 20 | CQI |
| 2a | QPSK+BPSK | 21 | CQI+ACK/NACK |
| 2b | QPSK+QPSK | 22 | CQI+ACK/NACK |
The carrier aggregation mode of the LTE-a system may be aggregation of a physical layer, or aggregation of a MAC (media access Control) layer. When MAC layer aggregation is employed, multiple HARQ (Hybrid Automatic Repeat Request) processes occur, and thus multiple ACKs/NACKs need to be fed back.
In a TDD (Time Division Duplex) system, due to the setting of the uplink and downlink ratio, the number of uplink timeslots may be smaller than the number of downlink timeslots, and at this Time, in order to reduce the transmission delay of data, ACK/NACK feedback needs to be performed on data of multiple downlink timeslots in one uplink timeslot. In the prior art, there are two main ways for TDD to feed back multiple ACKs/NACKs:
(1) ACK/NACK Bundling: performing logical AND (AND) operation on ACK/NACK corresponding to a plurality of downlink subframes, compressing the ACK/NACK into one ACK/NACK, transmitting the ACK/NACK on a single ACK/NACK channel resource, and adopting a format 1a when the ACK/NACK is compressed into 1bit, and adopting a format 1b when the ACK/NACK is compressed into 2 bit;
(2) ACK/NACK Multiplexing for channel selection: with format 1b, multiple ACK/NACK messages are fed back in one uplink slot. Firstly, performing logical AND (AND) compression on a single downlink subframe, and then feeding back a plurality of ACK/NACKs by adopting a rule of channel selection (each downlink subframe corresponds to one uplink ACK/NACK channel resource, and representative feedback types are sent on different channel resources).
When the LTE-A system adopts the existing TDD ACK/NACK Bundling mode, the ACK/NACK of all downlink aggregation carriers is compressed by logical AND (and), and feedback is carried out on a certain uplink ACK/NACK channel resource. As long as a PDSCH (Physical Downlink shared channel) of one of the element carriers is incorrect, NACK needs to be fed back, and an eNodeB (evolved nodeb) needs to retransmit all carriers, which increases air interface overhead.
When only a single ACK/NACK needs to be fed back, if the UE loses the PDCCH, the ACK/NACK will not be fed back, which corresponds to DTX (Discontinuous Transmission Mode) of the UE, and the eNodeB will then detect the DTX. However, when the LTE-a system needs to feed back multiple ACKs/NACKs, if an individual PDCCH is lost and the other PDSCHs received without errors, a single ACK will be fed back, and the eNodeB will not get a NACK or DTX indication for the lost PDCCH. If the problem of PDCCH loss is solved by adding a 2-bit downlink allocation indication to the PDCCH by adopting the existing TDD method, the content of the existing PDCCH needs to be modified or a new control format needs to be added.
And the ACK/NACK Multiplexing mode of the existing TDD channel selection is adopted, the link performance is poorer than that of the ACK/NACK Bundling mode, and the coverage range is limited.
In addition, in the related art, in order to maintain the characteristics of an Uplink single carrier, one terminal cannot simultaneously transmit a PUSCH (Physical Uplink Shared Channel) and a PUCCH at the same time. When uplink service data and uplink control signaling need to be transmitted simultaneously, the uplink control signaling and the uplink service data are transmitted in a multiplexing way on a PUSCH.
However, the uplink control signaling is different from the uplink traffic data, and there is no HARQ retransmission process. Therefore, on the PUSCH, especially when the channel quality is not ideal, the transmission reliability of the uplink control signaling cannot be guaranteed, and the method is not suitable for wide-range coverage.
Disclosure of Invention
Embodiments of the present invention provide a transmission method, apparatus, and system to flexibly select a transmission mode of a physical uplink control channel according to a terminal capability and feed back the physical uplink control channel.
To achieve the above object, an aspect of the embodiments of the present invention provides a transmission method, including:
determining physical uplink control channel resources allocated to a terminal according to terminal capabilities, wherein the terminal capabilities comprise one or more of the number of radio frequency chains configured by the terminal, the number of antennas configured by the terminal and the power limitation condition of the terminal;
and determining a physical uplink control channel transmission mode according to the physical uplink control channel resources allocated to the terminal, the control signaling type and the channel quality which need to be fed back, and feeding back the physical uplink control channel according to the physical uplink control channel transmission mode.
On the other hand, an embodiment of the present invention further provides a terminal, including:
a determining module, configured to determine, according to a terminal capability, a physical uplink control channel resource allocated to a terminal, where the terminal capability includes one or more of a number of radio frequency chains configured by the terminal, a number of antennas configured by the terminal, and a power limitation condition of the terminal;
a transmission mode determining module, configured to determine a physical uplink control channel transmission mode according to the physical uplink control channel resource allocated to the terminal and the type and channel quality of the control signaling to be fed back, which are determined by the determining module;
and the feedback module is used for feeding back the physical uplink control channel according to the transmission mode of the physical uplink control channel determined by the transmission mode determining module.
In another aspect, an embodiment of the present invention further provides a transmission system, including:
the terminal is used for determining a physical uplink control channel resource allocated to the terminal according to the terminal capability, determining a physical uplink control channel transmission mode according to the physical uplink control channel resource allocated to the terminal, and the type and the channel quality of a control signaling needing to be fed back, and feeding back the physical uplink control channel according to the physical uplink control channel transmission mode, wherein the terminal capability comprises one or more of the number of radio frequency chains configured by the terminal, the number of antennas configured by the terminal, and the power limitation condition of the terminal;
and the communication system is used for receiving the physical uplink control channel fed back by the terminal.
Compared with the prior art, the embodiment of the invention has the following advantages: through the embodiment of the invention, the terminal determines the transmission mode of the physical uplink control channel according to the self capability of the terminal and feeds back the physical uplink control channel according to the transmission mode of the physical uplink control channel. The method and the device realize the purpose of fully utilizing the capability of the terminal in the LTE-A system and flexibly selecting the transmitting mode of the physical uplink control channel. By the embodiment of the invention, each terminal can better utilize the advantages of the terminal or acquire more control channel resources, thereby feeding back more control information, improving the system performance and enhancing the cell edge coverage.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a flow chart of a transmission method according to an embodiment of the present invention;
fig. 2 is a schematic diagram illustrating timeslot-level switching of two radio frequency chains when ACK/NACK is transmitted according to an embodiment of the present invention;
fig. 3 is a schematic diagram illustrating timeslot-level switching performed by two radio frequency chains when transmitting CQI according to an embodiment of the present invention;
fig. 4 is a block diagram of a transmission system according to an embodiment of the present invention;
fig. 5 is a structural diagram of a terminal according to an embodiment of the present invention;
fig. 6 is a block diagram of another terminal according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the LTE-a system, a terminal has new capabilities, including: the terminal is configured with more radio frequency chains, and the transmitting power of the terminal is further enhanced.
According to the embodiment of the invention, different physical uplink control channel transmitting modes are adopted according to different terminal capabilities, different control signaling types needing to be fed back and different channel qualities:
(1) when multiple radio frequency chains are transmitted, one UE can obtain multiple physical uplink control channel resources, each radio frequency chain is allocated with one or more physical uplink control channel resources (when the terminal power is limited, only one channel resource can be allocated), and through the allocated physical uplink control channel resources, the UE can send a multi-bit control signaling to improve the capacity and also can send a small amount of bit control signaling to improve the performance and increase the coverage;
(2) in multi-radio frequency chain transmission, the PUCCH and the PUSCH (which may contain control information) can be transmitted on different radio frequency chains respectively, so that the edge coverage is enhanced.
Therefore, different physical uplink control channel transmitting modes are selected according to different application scenes, backward compatibility is maintained, the problems of air interface overhead and downlink allocation indication bit increase in an ACK/NACK Bundling mode are solved, and the problem of edge coverage of control signaling transmission on a PUSCH in ACK/NACK Multiplexing selected by a channel is solved.
As shown in fig. 1, a flowchart of a transmission method according to an embodiment of the present invention specifically includes:
step S101, determining a physical uplink control channel resource allocated to a terminal according to terminal capability, wherein the terminal capability comprises one or more of the number of radio frequency chains configured by the terminal, the number of antennas configured by the terminal and the power limitation condition of the terminal. The method specifically comprises the following steps:
when a terminal is configured with N radio frequency chains, if the power of the terminal is limited, M channel resources are allocated to each radio frequency chain of the terminal, wherein M is equal to 1, and N is a positive integer greater than 1; or,
when the terminal configures N radio frequency chains, if the power of the terminal is not limited, M channel resources are allocated to each radio frequency chain of the terminal, wherein N and M are positive integers greater than 1.
Step S102, determining a transmission mode of the physical uplink control channel according to the physical uplink control channel resources allocated to the terminal, the control signaling type and the channel quality which need to be fed back, and feeding back the physical uplink control channel according to the transmission mode of the physical uplink control channel.
When a physical uplink control channel bears single ACK/NACK feedback information, if a terminal occupies W ACK/NACK channels, wherein W is the product of N and M, the single ACK/NACK feedback information can be repeatedly borne on M channel resources for feedback; or, encoding original information bits of single ACK/NACK feedback information to obtain more bits, modulating the obtained more bits into W symbols, and respectively carrying the W symbols on the ACK/NACK channels for feedback.
When a physical uplink control channel bears multiple pieces of ACK/NACK feedback information, if a terminal occupies W pieces of ACK/NACK channels, wherein W is the product of N and M, when W is larger than the number of the ACK/NACK feedback information needing to be fed back, the original information bits of the ACK/NACK feedback information are coded to obtain more bits, and the obtained more bits are modulated into W symbols to be respectively borne on the W pieces of ACK/NACK channels for feedback; when W is equal to the number of the ACK/NACK feedback information to be fed back, respectively bearing the W ACK/NACK feedback information on W ACK/NACK channels for feedback; and when W is less than the number of the ACK/NACK feedback information to be fed back, performing logic and operation on the plurality of ACK/NACK feedback information to obtain W ACK/NACK feedback information, and respectively carrying the W ACK/NACK feedback information on W ACK/NACK channels for feedback.
When a physical uplink control channel carries CQI signals, if a terminal occupies W CQI channels, wherein W is the product of N and M, corresponding CQI bits are obtained by repeating, or coding or compressing original information bits of the CQI signals, and the original information bits are respectively carried on the W CQI channels for feedback after modulation.
In addition, when the physical uplink control channel transmits the SRI signal, if the terminal occupies W CQI channels, the SRI signal is fed back on the W SRI channels occupied by the terminal.
When a physical uplink control channel simultaneously bears ACK/NACK feedback information and SRI signals, if a terminal occupies W ACK/NACK channels and S SRI channels, wherein W is the product of N and M, and S is a positive integer which is greater than, equal to or smaller than W, when the SRI signals need to be fed back, one or more pieces of ACK/NACK feedback information are maintained, or subjected to logic and operation, or subjected to coding, or repeated to obtain S pieces of ACK/NACK feedback information which are respectively borne on the S SRI channels for feedback; when the SRI signal does not need to be fed back, one or more pieces of ACK/NACK feedback information are maintained, or subjected to logic AND operation, or subjected to coding, or repeated to obtain W pieces of ACK/NACK feedback information which are respectively loaded on W pieces of ACK/NACK channels for feedback.
When the terminal is configured with a plurality of radio frequency chains, the time slot level radio frequency chain switching can be carried out in the process of feeding back the physical uplink control channel; and the physical uplink control channel and the physical uplink shared channel can be carried on different radio frequency chains for feedback.
When the terminal is configured with only one radio frequency chain, and the radio frequency chain comprises a plurality of antennas, the time slot level antenna switching can be performed, and the physical uplink control channel is fed back.
In the transmission method, the terminal determines the physical uplink control channel resources allocated to the terminal according to the self capacity of the terminal, determines the transmission mode of the physical uplink control channel according to the physical uplink control channel resources allocated to the terminal, the type of the control signaling to be fed back and the channel quality, and feeds back the physical uplink control channel according to the transmission mode of the physical uplink control channel. Therefore, the capability of the terminal in the LTE-A system is fully utilized, and the transmitting mode of the physical uplink control channel is flexibly selected. By the embodiment of the invention, each terminal can better utilize the advantages of the terminal or acquire more control channel resources, thereby feeding back more control information, improving the system performance and enhancing the cell edge coverage
In the embodiment of the present invention, when a terminal supports multi-radio frequency chain configuration, one terminal may obtain multiple PUCCH channel resources: when the terminal power is limited, each radio frequency chain is only distributed to one PUCCH channel resource; when terminal power is not limited, each radio frequency chain may be allocated multiple PUCCH channel resources. A radio frequency chain in this embodiment includes a PA (Power Amplifier), one or more antennas, one or more D (Digital)/a (analog), and one or more mixers. The PUCCH channel resources may specifically be: ACK/NACK channel resources, CQI channel resources, and SRI (Scheduling Request Indicator) channel resources.
The following describes the feedback mode of ACK/NACK in the embodiment of the invention.
(1) Single ACK/NACK feedback
When the terminal is configured with only a single radio frequency chain: and adopting an ACK/NACK feedback mode of Rel-8. If the single radio frequency chain has a plurality of antennas, the time slot level antenna switching can be carried out, and the diversity gain is increased.
When the terminal is configured with N radio frequency chains (N > 1):
(a) when each terminal is only allocated with one ACK/NACK channel resource, the ACK/NACK feedback mode of Rel-8 is adopted. Within one subframe, ACK/NACK may be transmitted on the same antenna, or slot level antenna switching may be performed.
(b) When each radio frequency chain of each terminal is allocated to M ACK/NACK channel resources, if the power of the terminal is limited, M is 1; if the terminal power is not limited, M > 1. At this time, there may be 2 ways for ACK/NACK feedback:
in the first mode, all ACK/NACK channel resources bear the same ACK/NACK;
in the second method, 1-bit or 2-bit ACK/NACK is encoded into more bits, modulated into W BPSK (Binary Phase Shift Keying) or QPSK (quadrature Phase Shift Keying) symbols, and respectively carried on W ACK/NACK channels for transmission, where W is N × M.
(2) Multiple ACK/NACK feedback
When the terminal is configured with only a single radio frequency chain: and Multiplexing ACK/NACK Bundling of the Rel-8TDD or ACK/NACK Multiplexing structure of channel selection. If there are multiple antennas, it can switch the antennas in time slot stage to increase the diversity gain.
When the terminal is configured with N radio frequency chains (N > 1):
(a) and when each terminal is only allocated with one ACK/NACK channel resource, Multiplexing the ACK/NACK Bundling of the Rel-8TDD or an ACK/NACK Multiplexing structure for channel selection. Within one subframe, ACK/NACK may be transmitted on the same antenna, or slot level antenna switching may be performed.
(b) When each radio frequency chain of each terminal is allocated to M ACK/NACK channel resources, if the power of the terminal is limited, M is 1; if the terminal power is not limited, M > 1. When W is greater than the number of ACKs/NACKs to be fed back, the ACKs/NACKs may be repeated or encoded into more bits, modulated into W BPSK or QPSK symbols, and respectively carried on W ACK/NACK channels for transmission, where W is nxm; when W is equal to the number of ACK/NACK needing to be fed back, the W ACK/NACK signals are respectively borne on W ACK/NACK channel resources for transmission; when the W is less than the number of the ACK/NACK needing to be fed back, the ACK/NACK can be subjected to logical AND (AND) operation, namely ACK/NACK Bundling, W ACK/NACK modulation symbols are obtained and then are respectively borne on W ACK/NACK channel resources for transmission.
In the transmission process, time slot-level radio frequency chain switching can be performed, fig. 2 illustrates a case where two radio frequency chains perform time slot-level switching, for a first ACK/NACK modulation symbol, a first time slot is carried on ACK/NACK channel resources of the first radio frequency chain for transmission, and a second time slot is carried on ACK/NACK channel resources of the second radio frequency chain for transmission; for the second ACK/NACK modulation symbol, the first time slot is carried on the ACK/NACK channel resource of the second radio frequency chain for transmission, and the second time slot is carried on the ACK/NACK channel resource of the first radio frequency chain for transmission. The time slot level switching of more radio frequency chains is the same as the time slot level switching of two radio frequency chains, and the specific switching mode can be selected according to the channel condition.
The following describes a feedback method of CQI in the embodiment of the present invention.
(1) CQI raw bit is not increased
When the terminal is configured with only a single radio frequency chain: and adopting a CQI feedback mode of Rel-8. If there are multiple antennas in the radio frequency chain, the time slot level antenna switching can be performed to increase the diversity gain.
When the terminal is configured with N radio frequency chains (N > 1):
(a) when each terminal is allocated with only one CQI channel resource, a CQI feedback mode of Rel-8 is adopted. Within a subframe, CQI may be transmitted on the same antenna, and slot level antenna switching may also be performed.
(b) When each radio frequency chain of each terminal is allocated to M CQI channel resources, if the power of the terminal is limited, M is 1; if the terminal power is not limited, M > 1. The CQI original bits are generated by repeating or coding, modulated into QPSK symbols, and then transmitted on W CQI channels, where W is N × M.
(2) CQI raw bit increase
When the terminal is configured with only a single radio frequency chain: the CQI raw bits are compressed or transmitted over multiple subframes. If there are multiple antennas, the time slot level antenna switching can be performed to increase the diversity gain.
When the terminal is configured with N radio frequency chains (N > 1):
(a) when each terminal allocates only one CQI channel resource, CQI raw bits are compressed or CQI is transmitted over multiple subframes. Within a subframe, CQI may be transmitted on the same antenna, and slot level antenna switching may also be performed.
(b) When each radio frequency chain of each terminal is distributed to M CQI channel resources, if the power of the terminal is limited, M is 1; if the terminal power is not limited, M > 1. The CQI raw bits are encoded to generate more bits, modulated into QPSK symbols, and then transmitted over W (W × M) CQI channels.
Time slot level radio frequency chain switching can be performed during transmission, and fig. 3 illustrates a case where two radio frequency chains perform time slot level switching. On a first radio frequency chain, a first time slot bears CQI modulation symbols 0-4, and a second time slot bears CQI modulation symbols 15-19; on the second radio frequency chain, the first time slot carries CQI modulation symbols 10-14, and the second time slot carries CQI modulation symbols 5-9. Of course, the embodiment of the present invention is not limited to this, and other combination manners may be adopted, and the adopted combination manner does not affect the implementation of the embodiment of the present invention. The time slot level switching of more radio frequency chains is the same as the time slot level switching of two radio frequency chains, and the specific switching mode can be selected according to the channel condition.
The following describes a feedback method of SRI in the embodiment of the present invention.
When the terminal is configured with only a single radio frequency chain: the SRI feedback mode of Rel-8 is adopted. If the radio frequency chain has a plurality of antennas, the time slot level antenna switching can be carried out, and the diversity gain is increased.
When the terminal is configured with N radio frequency chains (N > 1):
(a) and when each terminal is only allocated with one SRI channel resource, adopting an SRI feedback mode of Rel-8. Within a subframe, the transmission can be carried out on the same antenna, and the time slot level antenna switching can also be carried out.
(b) When each radio frequency chain of each terminal is allocated to M SRI channel resources, if the power of the terminal is limited, M is 1; if the terminal power is not limited, M > 1. In this case, detection may be performed on W SRI channels, where W ═ N × M.
The following describes the way of transmitting SRI and ACK/NACK simultaneously in the embodiment of the present invention.
(1) Single ACK/NACK feedback
When the terminal is configured with only a single radio frequency chain: the feedback mode of Rel-8 is adopted. If the radio frequency chain has a plurality of antennas, the time slot level antenna switching can be carried out, and the diversity gain is increased.
When the terminal is configured with N radio frequency chains (N > 1):
(a) and when each terminal is only allocated with one SRI channel resource and one or more ACK/NACK channel resources, a Rel-8 feedback mode is adopted. Within a subframe, SRI and ACK/NACK may be transmitted on the same antenna, or slot level antenna switching may be performed.
(b) When each radio frequency chain of each terminal is allocated to S SRI channels and M ACK/NACK channel resources, if the power of the terminal is limited, L is 1, and M is 1; if the terminal power is not limited, L is more than 1, and M is more than 1. When the SRI does not need to be sent, repeating or coding the ACK/NACK to modulate W symbols, wherein W is NxM, and then respectively carrying the W ACK/NACK modulation symbols on W ACK/NACK channels for transmission; when the SRI needs to be sent, the ACK/NACK is repeatedly or code-modulated into S symbols, where S is N × L, and then the S ACK/NACK modulation symbols are respectively carried on S SRI channels for transmission. And time slot level radio frequency chain switching can be carried out in the transmission process.
(2) Multiple ACK/NACK feedback
When the terminal is configured with only a single radio frequency chain: if the SRI does not need to be sent, Multiplexing an ACK/NACK Bundling structure of the Rel-8TDD or an ACK/NACK Multiplexing structure selected by a channel and sending on an ACK/NACK channel; and if the SRI needs to be sent, performing Bundling on the ACK/NACK, and transmitting on an SRI channel. If a single radio frequency chain has a plurality of antennas, the time slot level antenna switching can be carried out, and the diversity gain is increased.
When the terminal is configured with N radio frequency chains (N > 1):
(a) each terminal is allocated only one SRI channel, and one or more ACK/NACK channels. If the SRI does not need to be sent, Multiplexing an ACK/NACK Bundling structure of the Rel-8TDD or an ACK/NACK Multiplexing structure selected by a channel and sending on an ACK/NACK channel; and if the SRI needs to be sent, performing Bundling on the ACK/NACK, and transmitting on an SRI channel. Within a subframe, the transmission can be carried out on the same antenna, and the time slot level antenna switching can also be carried out.
(b) Each radio frequency chain of each terminal is distributed to L SRI channels and M ACK/NACK channel resources, if the power of the terminal is limited, L is 1, and M is 1; if the terminal power is not limited, L is more than 1, and M is more than 1. When the SRI does not need to be sent, if W (W ═ nxm) is greater than the number of ACK/NACK needed to be fed back, the ACK/NACK can be repeated or encoded into more bits and modulated into W BPSK or QPSK symbols; when the W is less than the number of the ACK/NACK needing to be fed back, carrying out logic AND (AND) operation on the ACK/NACK, namely ACK/NACK Bundling, to obtain W ACK/NACK modulation symbols, and then respectively carrying the W ACK/NACK modulation symbols on W ACK/NACK channels for transmission; when the SRI needs to be sent, if S (S ═ nxl) is greater than the number of ACKs/NACKs to be fed back, the ACKs/NACKs may be repeated or encoded into more bits, and modulated into S BPSK or QPSK symbols; when S is smaller than the number of ACK/NACK required to be fed back, a logical and (and) operation, i.e., ACK/NACK Bundling, may be performed on the ACK/NACK first to obtain S ACK/NACK modulation symbols, and then the S ACK/NACK modulation symbols are respectively carried on S SRI channels for transmission. And time slot level radio frequency chain switching can be carried out in the transmission process.
The PUCCH transmission procedure based on terminal capability in the embodiment of the present invention is described below.
Firstly, the terminal determines a selectable PUCCH transmission mode according to the capability of the terminal, and then determines the PUCCH transmission mode according to the specific application scene requirement. For example: for ACK/NACK feedback, it is first clear whether the terminal supports multiple radio frequency chain transmission, whether power is limited, and whether downlink MAC layer carrier aggregation is supported (i.e., multiple ACK/NACK needs to be fed back).
If the terminal supports N (N > 1) radio frequency chain transmissions and is limited in power and needs to feed back M (M > 1) ACK/NACK, determining that the selectable PUCCH transmission mode is as follows:
the first scheme is as follows: each terminal only allocates one ACK/NACK channel resource, multiplexes ACK/NACK Bundling of Rel-8TDD or ACK/NACK Multiplexing structure of channel selection, and can transmit ACK/NACK on the same antenna or switch time slot level antennas in one subframe.
Scheme II: each radio frequency chain of each terminal is allocated to one ACK/NACK channel resource. Obtaining N BPSK or QPSK symbols through ACK/NACK Bundling (M is larger than N), or coding (M is smaller than N) or no change (M is equal to N), and respectively carrying the BPSK or QPSK symbols on N ACK/NACK channels for transmission, wherein the time slot level radio frequency chain switching can be carried out in the transmission process.
Then, determining a PUCCH transmission mode according to the specific application scene requirements, and if the channel quality is good, selecting a scheme II, reducing the air interface overhead and improving the capacity; if the channel quality is poor, option one is selected to enhance performance.
In the above description, various PUCCH transmission modes are mentioned, but in an actual LTE-a system, the partial modes may be disregarded, the selectable modes are narrowed, and signaling is reduced.
When the terminal supports more radio frequency chain configurations, if the PUSCH and the PUCCH need to be transmitted simultaneously, the PUSCH and the PUCCH of one terminal may be transmitted on different radio frequency chains, respectively. The content of the PUSCH bearer may or may not include uplink control information. And if the content of the PUSCH bearer contains the uplink control information, adopting a multiplexing structure of LTE Rel-8.
As shown in fig. 4, a structure diagram of a transmission system according to an embodiment of the present invention includes:
a terminal 41, configured to determine, according to a terminal capability, a physical uplink control channel resource allocated to the terminal, determine a physical uplink control channel transmission mode according to the physical uplink control channel resource allocated to the terminal, and a control signaling type and channel quality that need to be fed back, and feed back the physical uplink control channel according to the physical uplink control channel transmission mode, where the terminal capability includes one or more of a number of radio frequency chains configured for the terminal, a number of antennas configured for the terminal, and a power limitation condition of the terminal;
and a communication system 42, configured to receive the physical uplink control channel fed back by the terminal 41.
In the transmission system, the terminal 41 determines the physical uplink control channel resource allocated to the terminal according to the capability of the terminal 41 itself, determines the transmission mode of the physical uplink control channel according to the physical uplink control channel resource allocated to the terminal, and the type and the channel quality of the control signaling to be fed back, and feeds back the physical uplink control channel to the communication system 42 according to the transmission mode of the physical uplink control channel. Therefore, the capability of the terminal 41 is fully utilized, and the transmitting mode of the physical uplink control channel is flexibly selected. By the embodiment of the invention, each terminal can better utilize the advantages of the terminal or acquire more control channel resources, thereby feeding back more control information, improving the system performance and enhancing the cell edge coverage.
As shown in fig. 5, a structure diagram of a terminal according to an embodiment of the present invention includes:
a determining module 411, configured to determine, according to a capability of the terminal 41, a physical uplink control channel resource allocated to the terminal 41, where the capability of the terminal includes one or more of the number of radio frequency chains configured by the terminal 41, the number of antennas configured by the terminal 41, and a power limitation condition of the terminal 41;
a transmission mode determining module 412, configured to determine a physical uplink control channel transmission mode according to the physical uplink control channel resource allocated to the terminal and the type and channel quality of the control signaling to be fed back, which are determined by the determining module 411;
a feedback module 413, configured to feedback the physical uplink control channel according to the transmission mode of the physical uplink control channel determined by the transmission mode determining module 412.
The determining module 411 is specifically configured to, when the terminal 41 configures N radio frequency chains and the power of the terminal 41 is limited, allocate M physical uplink control channel resources to each radio frequency chain of the terminal 41, where M is equal to 1 and N is a positive integer greater than 1; or,
when the terminal 41 configures N radio frequency chains and the power of the terminal 41 is not limited, M physical uplink control channel resources are allocated to each radio frequency chain of the terminal 41, and the terminal 41 occupies W channels, where N and M are positive integers greater than 1, and W is a product of N and M.
As shown in fig. 6, the feedback module 413 may include:
a first feedback sub-module 4131, configured to repeatedly bear the single ACK/NACK feedback information on the M channel resources for feedback; or, encoding original information bits of single ACK/NACK feedback information to obtain more bits, modulating the obtained more bits into W symbols, and respectively carrying the W symbols on the ACK/NACK channels for feedback.
The feedback module 413 may include:
a second feedback sub-module 4132, configured to, when W is greater than the number of ACK/NACK feedback information to be fed back, encode original information bits of the ACK/NACK feedback information to obtain more bits, modulate the obtained more bits into W symbols, and respectively bear the W ACK/NACK channels for feedback; when W is equal to the number of the ACK/NACK feedback information to be fed back, respectively bearing the W ACK/NACK feedback information on W ACK/NACK channels for feedback; and when W is less than the number of the ACK/NACK feedback information to be fed back, performing logic and operation on the plurality of ACK/NACK feedback information to obtain W ACK/NACK feedback information, and respectively carrying the W ACK/NACK feedback information on W ACK/NACK channels for feedback.
The feedback module 413 may include:
and a third feedback sub-module 4133, configured to obtain corresponding CQI bits through repetition, or coding, or compression on the original CQI information bits, and load the CQI bits on W CQI channels after modulation for feedback.
The feedback module 413 may include:
a fourth feedback sub-module 4134, configured to, when the terminal 41 occupies W ACK/NACK channels and S SRI channels, if an SRI signal needs to be fed back, obtain S ACK/NACK feedback information by maintaining, or performing a logical and operation, or encoding, or repeating one or more ACK/NACK feedback information, and respectively bear the S ACK/NACK feedback information on the S SRI channels for feedback; when the SRI signal does not need to be fed back, one or more pieces of ACK/NACK feedback information are maintained, or subjected to logic AND operation, or subjected to coding, or subjected to repetition to obtain W pieces of ACK/NACK feedback information, and the W pieces of ACK/NACK feedback information are respectively loaded on W pieces of ACK/NACK channels for feedback, wherein S is a positive integer larger than, equal to or smaller than W.
In the terminal, the determining module 411 determines the physical uplink control channel resource allocated to the terminal 41 according to the capability of the terminal 41 itself, the transmission mode determining module 412 determines the transmission mode of the physical uplink control channel according to the physical uplink control channel resource allocated to the terminal determined by the determining module 411, and the type and the channel quality of the control signaling to be fed back, and the feedback module 413 feeds back the physical uplink control channel according to the transmission mode of the physical uplink control channel determined by the transmission mode determining module 412. Therefore, the capability of the terminal 41 in the LTE-A system is fully utilized, and the transmitting mode of the physical uplink control channel is flexibly selected. By the embodiment of the invention, each terminal can better utilize the advantages of the terminal or acquire more control channel resources, thereby feeding back more control information, improving the system performance and enhancing the cell edge coverage.
Embodiments of the present invention provide a transmission method, system, and apparatus, which fully utilize the new capability of a terminal in an LTE-a system, make the transmission mode of a PUCCH more flexible, and ensure backward compatibility. When the terminal supports multi-radio frequency chain configuration, each terminal can acquire more control channel resources through the embodiment of the invention, and the acquired control channel resources can be used for not only feeding back more control information, but also improving the performance and enhancing the cell edge coverage. When each radio frequency chain is only allocated with one channel resource, the uplink single carrier characteristic can be ensured.
Compared with multiplexing Rel-8TDDACK/NACK Bundling, the multi-ACK/NACK feedback scheme under the multi-radio frequency chain reduces air interface overhead; performance is improved compared to ACK/NACKMultiplexing for channel selection. Under the multi-radio frequency chain, the PUSCH and the PUCCH containing the control signaling are fed back respectively, and the cell edge coverage of the control signaling is enhanced.
Through the above description of the embodiments, those skilled in the art will clearly understand that the present invention may be implemented by hardware, or by software plus a necessary general hardware platform. Based on such understanding, the technical solution of the present invention can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (which can be a CD-ROM, a usb disk, a removable hard disk, etc.), and includes several instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the method according to the embodiments of the present invention.
Those skilled in the art will appreciate that the drawings are merely schematic representations of one preferred embodiment and that the blocks or flow diagrams in the drawings are not necessarily required to practice the present invention.
Those skilled in the art will appreciate that the modules in the devices in the embodiments may be distributed in the devices in the embodiments according to the description of the embodiments, and may be correspondingly changed in one or more devices different from the embodiments. The modules of the above embodiments may be combined into one module, or further split into multiple sub-modules.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
The above disclosure is only for a few specific embodiments of the present invention, but the present invention is not limited thereto, and any variations that can be made by those skilled in the art are intended to fall within the scope of the present invention.
Claims (17)
1. A method of transmission, comprising:
determining physical uplink control channel resources allocated to a terminal according to terminal capabilities, wherein the terminal capabilities comprise one or more of the number of radio frequency chains configured by the terminal, the number of antennas configured by the terminal and the power limitation condition of the terminal;
and determining a physical uplink control channel transmission mode according to the physical uplink control channel resources allocated to the terminal, the control signaling type and the channel quality which need to be fed back, and feeding back the physical uplink control channel according to the physical uplink control channel transmission mode.
2. The method of claim 1, wherein the determining, according to the terminal capability, the physical uplink control channel resources allocated to the terminal specifically comprises:
when the terminal is configured with N radio frequency chains, if the power of the terminal is limited, M physical uplink control channel resources are allocated to each radio frequency chain of the terminal, wherein M is equal to 1, and N is a positive integer greater than 1; or,
when the terminal is configured with N radio frequency chains, if the power of the terminal is not limited, M physical uplink control channel resources are allocated to each radio frequency chain of the terminal, wherein N and M are positive integers greater than 1.
3. The method of claim 2, wherein the physical uplink control channel carries a single ACK/NACK feedback information, and the terminal occupies W ACK/NACK channels, wherein W is a product of N and M,
the determining a transmission mode of the physical uplink control channel according to the physical uplink control channel resources allocated to the terminal, the type of the control signaling to be fed back and the channel quality, and feeding back the physical uplink control channel according to the transmission mode of the physical uplink control channel specifically includes:
repeatedly carrying the single ACK/NACK feedback information on the M channel resources for feedback; or,
and encoding the original information bits of the single ACK/NACK feedback information to obtain more bits, modulating the obtained more bits into W symbols, and respectively carrying the W symbols on the ACK/NACK channels for feedback.
4. The method of claim 2, wherein the physical uplink control channel carries multiple ACK/NACK feedback information, and the terminal occupies W ACK/NACK channels, wherein W is a product of N and M,
the determining a transmission mode of the physical uplink control channel according to the physical uplink control channel resources allocated to the terminal, the type of the control signaling to be fed back and the channel quality, and feeding back the physical uplink control channel according to the transmission mode of the physical uplink control channel specifically includes:
when the W is larger than the number of the ACK/NACK feedback information needing to be fed back, encoding original information bits of the ACK/NACK feedback information to obtain more bits, modulating the obtained more bits into W symbols, and respectively carrying the symbols on W ACK/NACK channels for feedback;
when the W is equal to the number of the ACK/NACK feedback information to be fed back, respectively bearing the W ACK/NACK feedback information on W ACK/NACK channels for feedback;
and when the W is less than the number of the ACK/NACK feedback information needing to be fed back, performing logic and operation on the plurality of ACK/NACK feedback information to obtain W ACK/NACK feedback information, and respectively carrying the W ACK/NACK feedback information on W ACK/NACK channels for feedback.
5. The method of claim 2, wherein the physical uplink control channel carries a Channel Quality Indication (CQI) signal, and the terminal occupies W CQI channels, wherein W is a product of N and M,
the determining a transmission mode of the physical uplink control channel according to the physical uplink control channel resources allocated to the terminal, the type of the control signaling to be fed back and the channel quality, and feeding back the physical uplink control channel according to the transmission mode of the physical uplink control channel specifically includes:
and repeating, or coding, or compressing the original information bits of the CQI signals to obtain corresponding CQI bits, and respectively carrying the CQI bits on W CQI channels for feedback after modulation.
6. The method of claim 2, wherein the physical uplink control channel carries a Scheduling Request Indication (SRI) signal, and the terminal occupies W CQI channels, wherein W is a product of N and M,
the determining a transmission mode of the physical uplink control channel according to the physical uplink control channel resources allocated to the terminal, the type of the control signaling to be fed back and the channel quality, and feeding back the physical uplink control channel according to the transmission mode of the physical uplink control channel specifically includes:
and feeding back SRI signals on W SRI channels occupied by the terminal.
7. The method of claim 2, wherein when the physical uplink control channel simultaneously carries ACK/NACK feedback information and SRI signals, the terminal occupies W ACK/NACK channels and S SRI channels, wherein W is a product of N and M, and S is a positive integer greater than, equal to, or less than W,
the feeding back the physical uplink control channel according to the determined transmission mode of the physical uplink control channel specifically includes:
when an SRI signal needs to be fed back, the one or more pieces of ACK/NACK feedback information are maintained, or subjected to logic AND operation, or subjected to coding, or repeated to obtain S pieces of ACK/NACK feedback information which are respectively loaded on S SRI channels for feedback;
when the SRI signal does not need to be fed back, one or more pieces of ACK/NACK feedback information are maintained, or subjected to logic AND operation, or subjected to coding, or repeated to obtain W pieces of ACK/NACK feedback information which are respectively loaded on W pieces of ACK/NACK channels for feedback.
8. The method according to any of claims 3-7, wherein slot level radio frequency chain switching is performed during feedback of physical uplink control channel.
9. The method of claim 1, further comprising: and carrying the physical uplink control channel and the physical uplink shared channel on different radio frequency chains for feedback.
10. The method of claim 1, wherein the feeding back the physical uplink control channel according to the determined transmission mode of the physical uplink control channel specifically comprises:
and when the terminal is configured with a radio frequency chain which comprises a plurality of antennas, carrying out time slot level antenna switching and feeding back a physical uplink control channel.
11. A terminal, comprising:
a determining module, configured to determine, according to a terminal capability, a physical uplink control channel resource allocated to a terminal, where the terminal capability includes one or more of a number of radio frequency chains configured by the terminal, a number of antennas configured by the terminal, and a power limitation condition of the terminal;
a transmission mode determining module, configured to determine a physical uplink control channel transmission mode according to the physical uplink control channel resource allocated to the terminal and the type and channel quality of the control signaling to be fed back, which are determined by the determining module;
and the feedback module is used for feeding back the physical uplink control channel according to the transmission mode of the physical uplink control channel determined by the transmission mode determining module.
12. The terminal of claim 11, wherein the determining module is specifically configured to, when the terminal configures N radio frequency chains and power of the terminal is limited, allocate M physical uplink control channel resources to each radio frequency chain of the terminal, where M is equal to 1 and N is a positive integer greater than 1; or,
when the terminal is configured with N radio frequency chains and the power of the terminal is not limited, M physical uplink control channel resources are allocated to each radio frequency chain of the terminal, and the terminal occupies W channels, wherein N and M are positive integers greater than 1, and W is the product of N and M.
13. The terminal of claim 12, wherein the feedback module comprises:
a first feedback sub-module, configured to repeatedly bear single ACK/NACK feedback information on the M channel resources for feedback; or, encoding the original information bits of the single ACK/NACK feedback information to obtain more bits, modulating the obtained more bits into W symbols, and respectively carrying on W ACK/NACK channels for feedback.
14. The terminal of claim 12, wherein the feedback module comprises:
the second feedback submodule is used for coding original information bits of the ACK/NACK feedback information to obtain more bits when the W is larger than the number of the ACK/NACK feedback information to be fed back, modulating the obtained more bits into W symbols and respectively loading the symbols on W ACK/NACK channels for feedback; when the W is equal to the number of the ACK/NACK feedback information to be fed back, respectively bearing the W ACK/NACK feedback information on W ACK/NACK channels for feedback; and when the W is less than the number of the ACK/NACK feedback information needing to be fed back, performing logic and operation on the plurality of ACK/NACK feedback information to obtain W ACK/NACK feedback information, and respectively carrying the W ACK/NACK feedback information on W ACK/NACK channels for feedback.
15. The terminal of claim 12, wherein the feedback module comprises:
and the third feedback sub-module is used for repeating, or coding, or compressing the original information bits of the CQI to obtain corresponding CQI bits, and the CQI bits are respectively loaded on the W CQI channels after modulation for feedback.
16. The terminal of claim 12, wherein the feedback module comprises:
a fourth feedback sub-module, configured to, when the terminal occupies W ACK/NACK channels and S SRI channels, if an SRI signal needs to be fed back, obtain S ACK/NACK feedback information by holding, performing a logical and operation, or encoding, or repeating one or more ACK/NACK feedback information, and respectively load the S ACK/NACK feedback information on the S SRI channels for feedback; when the SRI signal does not need to be fed back, one or more pieces of ACK/NACK feedback information are maintained, or subjected to logic AND operation, or subjected to coding, or subjected to repetition to obtain W pieces of ACK/NACK feedback information, and the W pieces of ACK/NACK feedback information are respectively loaded on W pieces of ACK/NACK channels for feedback, wherein S is a positive integer larger than, equal to or smaller than W.
17. A transmission system, comprising:
the terminal is used for determining a physical uplink control channel resource allocated to the terminal according to the terminal capability, determining a physical uplink control channel transmission mode according to the physical uplink control channel resource allocated to the terminal, and the type and the channel quality of a control signaling needing to be fed back, and feeding back the physical uplink control channel according to the physical uplink control channel transmission mode, wherein the terminal capability comprises one or more of the number of radio frequency chains configured by the terminal, the number of antennas configured by the terminal, and the power limitation condition of the terminal;
and the communication system is used for receiving the physical uplink control channel fed back by the terminal.
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| CN102164029A (en) * | 2011-04-29 | 2011-08-24 | 电信科学技术研究院 | Method and device for transmitting ACK (acknowledgement)/NACK (negative acknowledgement) feedback information |
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| CN109327910B (en) * | 2017-07-31 | 2023-05-12 | 中兴通讯股份有限公司 | Physical channel resource allocation method and device |
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| WO2022226877A1 (en) * | 2021-04-29 | 2022-11-03 | Qualcomm Incorporated | Transmit chain switching preparation time for uplink shared channel |
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