CN109475000B - Shared channel resource allocation method, device and network side equipment - Google Patents
Shared channel resource allocation method, device and network side equipment Download PDFInfo
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- CN109475000B CN109475000B CN201710807635.6A CN201710807635A CN109475000B CN 109475000 B CN109475000 B CN 109475000B CN 201710807635 A CN201710807635 A CN 201710807635A CN 109475000 B CN109475000 B CN 109475000B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0091—Signaling for the administration of the divided path
- H04L5/0094—Indication of how sub-channels of the path are allocated
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- Computer Networks & Wireless Communication (AREA)
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Abstract
The invention provides a method and a device for allocating shared channel resources and network side equipment. The method comprises the following steps: a network side configures downlink control information for user equipment, wherein the downlink control information indicates a starting symbol and a terminating symbol of a physical downlink shared channel and a physical uplink shared channel predetermined by the user equipment; and when the starting symbol is positioned behind the symbol occupied by the pre-demodulation reference signal of the user equipment, mapping the physical downlink shared channel and the physical uplink shared channel to the symbols between the starting symbol and the ending symbol except the symbol occupied by the extra demodulation reference signal of the user equipment in the time domain. The invention can reduce the signaling overhead of the downlink control information and improve the system performance.
Description
Technical Field
The present invention relates to the field of mobile communications technologies, and in particular, to a method, an apparatus, and a network device for allocating shared channel resources.
Background
In the chairman conference record formed by RAN1#90 conferences, for single-slot and multi-slot scheduling, the user equipment is notified by Downlink Control Information (DCI) of a starting symbol and a terminating symbol of a predetermined Physical Downlink Shared Channel (PDSCH) and a Physical Uplink Shared Channel (PUSCH), that is, the number of symbols occupied by the PDSCH and the PUSCH in a subframe (that is, the positions of the PDSCH and the PUSCH in the time domain of the subframe) is indicated by the DCI.
In the prior art, for a multi-user system, when a base station allocates PDSCH and PUSCH channel resources to different user equipments, DCI not only needs to indicate a starting symbol and a terminating symbol of PDSCH and PUSCH predetermined by the current user equipment, but also needs to indicate which resource elements of the current user equipment are already occupied by DeModulation Reference signals (DMRSs) of other user equipments, and avoid the resource elements. Therefore, the signaling overhead of the DCI is large, which affects the system performance.
Disclosure of Invention
The method, the device and the network side equipment for allocating the shared channel resources can reduce the signaling overhead of downlink control information and improve the system performance.
In a first aspect, the present invention provides a method for allocating shared channel resources, including:
configuring downlink control information for user equipment, wherein the downlink control information indicates a starting symbol and a terminating symbol of a physical downlink shared channel and a physical uplink shared channel predetermined by the user equipment;
and when the starting symbol is positioned behind a symbol occupied by a pre-demodulation reference signal of the user equipment, mapping the physical downlink shared channel and the physical uplink shared channel to symbols between the starting symbol and the ending symbol except for the symbol occupied by an additional demodulation reference signal of the user equipment in a time domain.
Optionally, the starting symbol is located at the first symbol after a symbol occupied by a pre-demodulation reference signal of the user equipment.
Optionally, the preamble demodulation reference signal of the ue occupies 1 or 2 symbols.
Optionally, the user equipment includes a plurality of additional demodulation reference signals, and the number of symbols of each additional demodulation reference signal is the same as the number of symbols of the preamble demodulation reference signal.
In a second aspect, the present invention provides an apparatus for allocating shared channel resources, including:
a configuration module, configured to configure downlink control information for a user equipment, where the downlink control information indicates a starting symbol and a terminating symbol of a physical downlink shared channel and a physical uplink shared channel predetermined by the user equipment;
a mapping module, configured to map, in a time domain, the physical downlink shared channel and the physical uplink shared channel to a symbol between the starting symbol and the terminating symbol, except for a symbol occupied by an extra demodulation reference signal of the user equipment, when the starting symbol is located after a symbol occupied by a pre-demodulation reference signal of the user equipment.
Optionally, the starting symbol is located at the first symbol after a symbol occupied by a pre-demodulation reference signal of the user equipment.
Optionally, the preamble demodulation reference signal of the ue occupies 1 or 2 symbols.
Optionally, the user equipment includes a plurality of additional demodulation reference signals, and the number of symbols of each additional demodulation reference signal is the same as the number of symbols of the preamble demodulation reference signal.
In a third aspect, the present invention provides a network side device, where the network side device includes the foregoing shared channel resource allocation apparatus.
According to the shared channel resource allocation method, the device and the network side equipment provided by the invention, downlink control information is configured for user equipment, and the downlink control information indicates a starting symbol and a terminating symbol of a physical downlink shared channel and a physical uplink shared channel which are preset by the user equipment; and when the starting symbol is positioned behind a symbol occupied by a pre-demodulation reference signal of the user equipment, mapping the physical downlink shared channel and the physical uplink shared channel to symbols between the starting symbol and the ending symbol except for the symbol occupied by an additional demodulation reference signal of the user equipment in a time domain. It can be seen that, by determining the position of the start symbol, mapping of the shared channel resources can be implicitly indicated, that is, the position of the start symbol implies a hint on how to map the shared channel resources, and compared with the prior art, the downlink control information only needs to indicate the start symbol and the end symbol of the physical downlink shared channel and the physical uplink shared channel, and does not explicitly indicate which resource units are already occupied by demodulation reference signals of other user equipment, thereby reducing signaling overhead of the downlink control information and improving system performance.
Drawings
Fig. 1 is a flowchart of a method for allocating shared channel resources according to an embodiment of the present invention;
fig. 2 is a resource mapping diagram of a shared channel when a user equipment (with a number of pre-DMRS symbols of 1) applies the present invention;
fig. 3 is a resource mapping diagram of a shared channel when two user equipments (the numbers of pre-DMRS symbols are both 1) apply the present invention;
fig. 4 is a resource mapping diagram of a shared channel when four user equipments (all the numbers of pre-DMRS symbols are 1) apply the present invention;
fig. 5 is a resource mapping diagram of a shared channel when a user equipment (with a preamble DMRS symbol number of 2) applies the present invention;
fig. 6 is a resource mapping diagram of a shared channel when four user equipments (all the numbers of pre-DMRS symbols are 2) apply the present invention;
fig. 7 is a shared channel resource map when four user equipments (all of the pre-DMRS symbols are 2, including two additional DMRSs) apply the present invention;
fig. 8 is a schematic structural diagram of an apparatus for allocating shared channel resources according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are 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.
An embodiment of the present invention provides a method for allocating shared channel resources, and as shown in fig. 1, the method includes:
s11, the network side configures downlink control information for the ue, where the downlink control information indicates a starting symbol and a terminating symbol of a physical downlink shared channel and a physical uplink shared channel predetermined by the ue.
And S12, when the starting symbol is positioned behind the symbol occupied by the pre-demodulation reference signal of the user equipment, mapping the physical downlink shared channel and the physical uplink shared channel to the symbols between the starting symbol and the ending symbol except the symbol occupied by the extra demodulation reference signal of the user equipment in the time domain.
The starting symbol may be located at the first symbol after the symbol occupied by the pre-demodulation reference signal, that is, the starting symbol is immediately adjacent to the symbol occupied by the pre-demodulation reference signal, and sometimes, the starting symbol may be separated from the symbol occupied by the pre-demodulation reference signal by several symbols.
The DMRS includes a preamble DMRS and an additional DMRS, for a timeslot, typically, the first two symbols are used for a Downlink Control Channel (PDCCH), the last 1 or 2 symbols are used for the preamble DMRS, and the additional DMRS may be set according to system requirements, and there may be a plurality of additional DMRSs, where the number of symbols of each additional DMRS is the same as the number of symbols of the preamble DMRS. For example, the preamble DMRS occupies one symbol, there may be one or two additional DMRSs, where each additional DMRS occupies one symbol; as another example, the preamble DMRS occupies two symbols, there may be one or two additional DMRSs, each occupying two symbols.
As shown in fig. 2, a shared channel resource mapping situation of a user equipment is shown, the number of the pre-DMRS symbols of the user equipment is 1, the 3 rd symbol is occupied, the number of the additional DMRS symbols is 1, the 8 th symbol is occupied, the starting symbol of the PDSCH and the PUSCH is defined as the 4 th symbol, the terminating symbol is defined as the 9 th symbol, the 8 th symbol is avoided when the PDSCH and the PUSCH are mapped on the time domain because the 8 th symbol is occupied by the additional DMRS, and the PDSCH and the PUSCH are mapped from the 4 th symbol on the time domain to the 4 th to 7 th and 9 th symbols assuming that no other reference signal occupies resources between the starting symbol and the terminating symbol.
For a multi-user system, normally, DMRSs of all user equipments occupy the same symbol during design, and resource occupancy of PDSCH and PUSCH are also the same, for two user equipments, as shown in fig. 3, the numbers of pre-DMRS and extra DMRS symbols of a first user equipment and a second user equipment are both 1, pre-DMRS occupies the 3 rd symbol, and extra DMRS occupies the 8 th symbol, except that DMRSs of the two user equipments occupy different subcarriers in the frequency domain, PDSCH and PUSCH predetermined by the two user equipments are the same, starting symbols of PDSCH and PUSCH are defined as the 4 th symbol, terminating symbols are defined as the 9 th symbol, and since the 8 th symbol is occupied by the extra DMRS, PDSCH and PUSCH are mapped from the 4 th symbol in the time domain, to the 4 th to 7 th symbols, and to the 9 th symbol. When the system has a third user equipment, the symbol occupation situation of the DMRS of the third user equipment is the same as that of the first user equipment, and when the system has a fourth user equipment, the symbol occupation situation of the DMRS of the fourth user equipment is the same as that of the second user equipment, and so on. As shown in fig. 4, the mapping situation of the shared channel resources of four ues is shown, and when they are mapped to one map, it is only necessary to superimpose the data at the same position of each ue.
Similarly, when the number of the pre-DMRS symbols of the user equipment is 2, as shown in fig. 5, the shared channel resource mapping situation of one user equipment is represented, where the number of the pre-DMRS symbols of the user equipment is 2, and occupies the 3 rd and 4 th symbols, the number of the extra DMRS symbols is 2, and occupies the 8 th and 9 th symbols, the starting symbol of the PDSCH and the PUSCH is defined as the 5 th symbol, and the terminating symbol is defined as the 9 th symbol, and since the 8 th and 9 th symbols are occupied by the extra DMRS, the PDSCH and the PUSCH are mapped from the 5 th symbol in the time domain to the 5 th to 7 th symbols. For the multi-user system, as shown in fig. 6, the shared channel resource mapping situation of each of four user equipments is shown, at this time, the numbers of the pre-DMRS and the extra DMRS symbols of each user equipment are both 2, the pre-DMRS occupies the 3 rd and 4 th symbols, the extra DMRS occupies the 8 th and 9 th symbols, the starting symbol of the PDSCH and the PUSCH is defined as the 5 th symbol, the terminating symbol is defined as the 9 th symbol, and since the 8 th and 9 th symbols are occupied by the extra DMRS, the PDSCH and the PUSCH are mapped to the 5 th to 7 th symbols starting from the 5 th symbol in the time domain. When they are mapped to a graph, only the data of the same position of each user equipment needs to be superposed.
In the above-mentioned embodiments, there is only one additional DMRS, and the present invention is equally applicable when there are multiple additional DMRSs. Taking two additional DMRSs as an example, as shown in fig. 7, the shared channel resource mapping situation of each of four user equipments is shown, where the number of symbols of the pre-DMRS of each user equipment is 2, the 3 rd and 4 th symbols are occupied, the number of symbols of the two additional DMRSs is 2, one of the symbols occupies the 7 th and 8 th symbols, the other occupies the 11 th and 12 th symbols, the starting symbol of the PDSCH and PUSCH is defined as the 5 th symbol, the terminating symbol is defined as the 14 th symbol, and finally the PDSCH and PUSCH are mapped to the 5 th, 6 th, 9 th, 10 th, 13 th and 14 th symbols. When they are mapped to a graph, only the data of the same position of each user equipment needs to be superposed.
It should be noted that, the above embodiments are all directed to single-slot scheduling, and for multi-slot scheduling, the channel mapping situation of each slot is the same as that of single-slot scheduling.
The method for allocating shared channel resources provided in the embodiments of the present invention can implicitly indicate mapping of shared channel resources by determining positions of starting symbols of a physical downlink shared channel and a physical uplink shared channel, that is, positions of the starting symbols imply a hint on how to map the shared channel resources, regardless of single-slot scheduling or multi-slot scheduling, or regardless of a single-user system or a multi-user system.
An embodiment of the present invention further provides a device for allocating shared channel resources, and as shown in fig. 8, the device includes:
a configuration module 71, configured to configure downlink control information for a user equipment, where the downlink control information indicates a starting symbol and a terminating symbol of a physical downlink shared channel and a physical uplink shared channel predetermined by the user equipment;
a mapping module 72, configured to map the physical downlink shared channel and the physical uplink shared channel to symbols between the starting symbol and the terminating symbol except for a symbol occupied by an extra demodulation reference signal of the ue, in a time domain, when the starting symbol is located after a symbol occupied by a pre-demodulation reference signal of the ue.
Typically, the starting symbol is located at the first symbol after the symbol occupied by the pre-demodulation reference signal of the user equipment. The pre-demodulation reference signal of the user equipment occupies 1 or 2 symbols, the user equipment comprises a plurality of additional demodulation reference signals, and the number of symbols of each additional demodulation reference signal is the same as that of the pre-demodulation reference signal.
The shared channel resource allocation device provided in the embodiment of the present invention can implicitly indicate mapping of shared channel resources by determining the positions of starting symbols of a physical downlink shared channel and a physical uplink shared channel, that is, the positions of the starting symbols imply a hint on how to map the shared channel resources.
The embodiment of the invention also provides network side equipment, and the network side equipment comprises the shared channel resource allocation device.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are also within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (9)
1. A method for allocating resources of a shared channel, comprising:
configuring downlink control information for user equipment, wherein the downlink control information indicates a starting symbol and a terminating symbol of a physical downlink shared channel and a physical uplink shared channel which are preset by the user equipment;
and when the starting symbol is positioned behind a symbol occupied by a pre-demodulation reference signal of the user equipment, mapping the physical downlink shared channel and the physical uplink shared channel to symbols between the starting symbol and the ending symbol except for the symbol occupied by an additional demodulation reference signal of the user equipment in a time domain.
2. The method of claim 1, wherein the starting symbol is located at a first symbol after a symbol occupied by a preamble demodulation reference signal of the UE.
3. The method of claim 1, wherein the pre-demodulation reference signal of the UE occupies 1 or 2 symbols.
4. The method according to claim 1, wherein the UE comprises a plurality of additional demodulation reference signals, and the number of symbols of each additional demodulation reference signal is the same as that of the preamble demodulation reference signal.
5. An apparatus for allocating shared channel resources, comprising:
a configuration module, configured to configure downlink control information for a user equipment, where the downlink control information indicates a starting symbol and a terminating symbol of a physical downlink shared channel and a physical uplink shared channel predetermined by the user equipment;
and a mapping module, configured to map, when the starting symbol is located after a symbol occupied by a pre-demodulation reference signal of the ue, the physical downlink shared channel and the physical uplink shared channel to a symbol between the starting symbol and the terminating symbol, except for a symbol occupied by an extra demodulation reference signal of the ue.
6. The apparatus of claim 5, wherein the starting symbol is located at a first symbol after a symbol occupied by a pre-demodulation reference signal of the UE.
7. The apparatus of claim 5, wherein the pre-demodulation reference signal of the UE occupies 1 or 2 symbols.
8. The apparatus of claim 5, wherein the UE comprises a plurality of additional demodulation reference signals, and wherein the number of symbols of each additional demodulation reference signal is the same as the number of symbols of the preamble demodulation reference signal.
9. A network side device, characterized in that the network side device comprises the shared channel resource allocation apparatus according to any one of claims 5 to 8.
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