Uplink transmission control method and apparatus and communication system
地域：
Kawasaki
摘要
An uplink transmission control method and apparatus and a communication system. The network device explicitly or implicitly indicates dynamic scheduling information of RACH resources via control signaling. After selecting RACH resources, the user equipment (UE) monitors control signaling corresponding to the RACH resources. According to situations of receiving the control signaling, when the selected RACH resources are available, the UE directly transmits a random access request matched with the RACH resources; and when the selected RACH resources are unavailable, the UE further selects RACH resources according to configuration or indication of a base station, and until an RACH resource is available, the UE transmits a random access request matched with the RACH resource. Hence, normal random access of the UE may be ensured, and interference to other UEs may be reduced.
說明書
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This application is a continuation application of International Application PCT/CN2016/111799 filed on Dec. 23, 2016, the entire contents of which are incorporated herein by reference.
This disclosure relates to the field of communications, and in particular to an uplink transmission control method and apparatus and a communication system.
Long term evolution (LTE) supports two duplexing modes, frequency division duplexing (FDD) and time division duplexing (TDD), these two duplexing modes respectively supporting paired spectrum and non-paired spectrum. In a TDD operation, a cell achieves uplink and downlink transmission at an individual carrier frequency in a time division manner. In order to be adapted for different uplink and downlink flow proportion, the LTE supports seven uplink and/or downlink (UL/DL) configurations, and a cell informs a user equipment (UE) of a selected UL/DL configuration by broadcasting via a first system information block (SIB1). Generally speaking, the UL/DL configuration is relatively static, and the UL/DL configuration is permitted to be changed only at relatively long time intervals, so as to be adapted for changed traffic models.
權利要求
What is claimed is:1. An uplink transmission control apparatus, comprising:a memory that stores a plurality of instructions; and a processor coupled to the memory and configured to execute the instructions to: indicate a transmission configuration via a physical downlink control channel (PDCCH), the transmission configuration implicitly indicating whether a random access control channel (RACH) resource is available by a transmission direction, wherein the RACH resource is semi-statically configured via a RACH configuration, wherein the RACH resource comprises a time resource and a frequency resource, wherein the RACH resource spans a plurality of symbols within a slot, wherein symbols) for uplink direction and symbol(s) for downlink direction in the slot are indicated by the transmission configuration, and wherein, the processor is further configured to determine the RACH resource is available when the transmission direction of all of the symbols where the RACH resource is located is an uplink direction. 2. The uplink transmission control apparatus according to claim 1 , wherein,the RACH configuration includes a first configuration and a second configuration, wherein a time length of the RACH resource configured by the first configuration and the time length of the RACH resource configured by the second configuration are different. 3. The uplink transmission control apparatus according to claim 2 , wherein the RACH configuration includes the first configuration and the second configuration, and wherein the RACH resource configured by the first configuration and the RACH resource configured by the second configuration overlap with each other in time domain. 4. The uplink transmission control apparatus according to claim 1 , wherein a UE determines the transmission direction of the symbols where the RACH resource is located according to the transmission configuration. 5. The uplink transmission control apparatus according to claim 4 , wherein, the processor is further configured to determine the RACH resource is not available when the transmission direction of all or part of the symbols where the RACH resource is located is a downlink direction. 6. The uplink transmission control apparatus according to claim 1 , wherein different types of RACH resources occupy different time lengths and/or frequency-domain widths and/or numbers of subcarriers, or different types of RACH resources employ different numerologies, or different types of RACH resources are used for transmitting different preambles, or different types of RACH resources are used for transmitting different preambles and data. 7. The apparatus according to claim 1 , wherein different types of RACH resources correspond to different preamble configurations. 8. A User Equipment (UE), comprising:a memory that stores a plurality of instructions; a processor coupled to the memory and configured to execute the instructions to: monitor a transmission configuration via physical downlink control channel (PDCCH); and determine whether a random access channel (RACH) resource is available according to the transmission configuration: wherein the transmission configuration implicitly indicates whether the RACH resource is available by a transmission direction; and a transmitter configured to transmit a preamble when determining a RACH resource is available, wherein the RACH resource is semi-statically configured via a RACH configuration, wherein the RACH resource comprises a time resource and a frequency resource, wherein the RACH resource spans a plurality of symbols within a slot, wherein symbol(s) for uplink direction and symbol(s) for downlink direction in the slot are indicated by the transmission configuration, and wherein, the processor is further configured to determine the RACH resource is available when the transmission direction of all of the symbols where the RACH resource is located is an uplink direction. 9. The UE according to claim 8 , wherein the processor is further configured to determine the transmission direction of the symbols where the RACH resource is located according to the transmission configuration. 10. The UE according to claim 9 , wherein the processor is further configured to determine that the RACH resource is not available when the transmission direction of all or part of the symbol where the RACH resource is located is a down link direction. 11. A communication system, comprising:a network device configured to indicate a transmission configuration via a physical downlink control channel (PDCCH), the transmission configuration implicitly indicating whether a random access control channel (RACH) resource is available by a transmission direction; and a User Equipment (UE) configured to select a RACH resource based on the transmission configuration received via the PDCCH, wherein the RACH resource is semi-statically configured via a RACH configuration, wherein the RACH resource comprises a time resource and a frequency resource, wherein the RACH resource spans a plurality of symbols within a slot, wherein symbol(s) for uplink direction and symbol(s) for downlink direction in the slot are indicated by the transmission configuration, and wherein, the UE is configured to determine the RACH resource is available when the transmission direction of all of the symbols where the RACH resource is located is an uplink direction. 12. A base station comprising:a transmitter configured to transmit transmission configuration information via a physical downlink control channel (PDCCH), the transmission configuration information indicating whether a random access channel (RACH) resource is available by a transmission direction; and a receiver configured to receive a preamble transmitted according to the transmission configuration information, wherein the RACH resource is semi-statically configured via a RACH configuration, and wherein the RACH resource comprises a time resource and a frequency resource, wherein the RACH resource spans a plurality of symbols within a slot, wherein symbol(s) for uplink direction and symbol(s) for downlink direction in the slot are indicated by the transmission configuration, and wherein, the RACH resource is determined as available when the transmission direction of all of the symbols where the RACH resource is located is an uplink direction.
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