Wireless telecommunications apparatus and methods
A method of operating a wireless telecommunications system for communicating higher layer data from network infrastructure comprises establishing an allocation of radio resources for the network infrastructure equipment to use for transmitting higher layer data to the terminal device during a higher layer data transmission period; transmitting an indication of the allocated radio resources to the terminal device; beginning transmission of the higher layer data to the terminal device at the beginning of the higher layer data transmission period; and subsequently identifying during the higher layer data transmission period whether any of the allocated radio resources which have not yet been used are needed by the network infrastructure equipment for transmitting other data in the wireless telecommunications system.
1. A method of operating a transmitter entity in a wireless telecommunications system for communicating higher layer data to a receiver entity, wherein the method comprises:
establishing an allocation of radio resources for the transmitter entity to use for transmitting higher layer data to the receiver entity during a higher layer data transmission period;
transmitting an indication of the allocated radio resources to the receiver entity, wherein the indication includes a predefined signature sequence;
beginning transmission of the higher layer data to the receiver entity at the beginning of the higher layer data transmission period using the allocated radio resources; and
identifying during the higher layer data transmission period whether any of the allocated radio resources which have not yet been used are needed by the transmitter entity for transmitting other data in the wireless telecommunications system, and if so, establishing a subset of the allocated radio resources for the transmitter entity to use for transmitting the other data and transmitting the other data using the subset of the allocated radio resources;
wherein the method further comprises the transmitter entity conveying to the receiver entity during the higher layer data transmission period an indication of the subset of allocated radio resources used for the transmission of other data; and
wherein the predefined signature sequence is selected by the transmitter entity from among a plurality of predefined signature sequences according to whether the transmission of the higher layer data to the receiver entity is a first transmission of the higher layer data to the receiver entity or a retransmission of the higher layer data to the receiver entity.
2. The method of claim 1 , wherein the predefined signature sequence is in a control channel region for the other data that is multiplexed along with a data channel for the other data into a data channel period of the allocation of radio resources in the higher layer data transmission period.
3. The method of claim 1 , wherein the method further comprises dividing the higher layer data into a plurality of higher layer data code blocks and applying error detection coding to individual higher layer data code blocks before transmission to the receiver entity, whereby detection of an error by the receiver entity during decoding in respect of one or more of the higher layer data code blocks provides the receiver entity with the indication of the subset of allocated radio resources used for the transmission of other data.
4. The method of claim 3 , wherein the error detection coding is based on a cyclic redundancy check process and/or wherein the error detection coding is based on a parity check process.
5. The method of claim 1 , wherein respective ones of the plurality of predefined signature sequences are associated with different amounts of radio resource, and the predefined signature sequence is selected by the transmitter entity from among the plurality of predefined signature sequences according to the amount of radio resources used for transmission of other data.
6. The method of claim 1 , further comprising transmitting reference symbols during the higher layer transmission period to allow the receiver entity to estimate channel conditions for the allocated radio resources, and modifying the transmission of reference symbols provided for estimating channel conditions for the subset of allocated radio resources used for transmitting other data to provide the receiver entity with the indication of the subset of allocated radio resources used for the transmission of other data.
7. The method of claim 1 , further comprising transmitting higher layer data as a plurality of symbols, and set one or more data bits in one or more symbols carried on the subset of allocated radio resources used for transmitting other data to a predetermined value to provide the receiver entity with the indication of the subset of allocated radio resources used for the transmission of other data.
8. A transmitter entity for use in a wireless telecommunications system for communicating higher layer data to a receiver entity, wherein the transmitter entity comprises controller circuitry and transceiver circuitry configured to operate together such that the transmitter entity is operable to:
establish an allocation of radio resources for the transmitter entity to use for transmitting higher layer data to the receiver entity during a higher layer data transmission period;
transmit an indication of the allocated radio resources to the receiver entity, wherein the indication includes a predefined signature sequence;
begin transmission of the higher layer data to the receiver entity at the beginning of the higher layer data transmission period using the allocated radio resources;
identify during the higher layer data transmission period whether any of the allocated radio resources which have not yet been used are needed by the transmitter entity for transmitting other data in the wireless telecommunications system, and if so, establish a subset of the allocated radio resources for the transmitter entity to use for transmitting the other data and transmit the other data using the subset of the allocated radio resources; and
convey to the receiver entity during the higher layer data transmission period an indication of the subset of allocated radio resources used for the transmission of other data,
wherein the predefined signature sequence is selected by the transmitter entity from among a plurality of predefined signature sequences according to whether the transmission of the higher layer data to the receiver entity is a first transmission of the higher layer data to the receiver entity or a retransmission of the higher layer data to the receiver entity.
9. The transmitter entity of claim 8 , wherein the predefined signature sequence in a control channel region for the other data that is multiplexed along with a data channel for the other data into a data channel period of the allocation of radio resources in the higher layer data transmission period.
10. The transmitter entity of claim 8 , wherein the transmitter entity is further operable to:
divide the higher layer data into a plurality of higher layer data code blocks and apply error detection coding to individual higher layer data code blocks before transmission to the receiver entity, whereby detection of an error by the receiver entity during decoding in respect of one or more of the higher layer data code blocks provides the receiver entity with the indication of the subset of allocated radio resources used for the transmission of other data.
11. The transmitter entity of claim 10 , wherein the error detection coding is based on a cyclic redundancy check process and/or wherein the error detection coding is based on a parity check process.
12. The transmitter entity of claim 8 , wherein respective ones of the plurality of predefined signature sequences are associated with different amounts of radio resource, and the transmitter entity is further operable to select the predefined signature sequence from among the plurality of predefined signature sequences according to the amount of radio resources used for transmission of other data.
13. The transmitter entity of claim 8 , wherein the transmitter entity is further operable to transmit reference symbols during the higher layer transmission period to allow the receiver entity to estimate channel conditions for the allocated radio resources, and modify the transmission of reference symbols provided for estimating channel conditions for the subset of allocated radio resources used for transmitting other data to provide the receiver entity with the indication of the subset of allocated radio resources used for the transmission of other data.
14. A receiver entity for use in a wireless telecommunications system for receiving higher layer data from a transmitter entity, wherein the receiver entity comprises controller circuitry and transceiver circuitry configured to operate together such that the receiver entity is operable to:
receive from the transmitter entity an indication of an allocation of radio resources for the receiver entity to use for receiving higher layer data from the transmitter entity during a higher layer data transmission period, wherein the indication includes a predefined signature sequence;
receive transmissions from the transmitter entity on the allocated radio resources; and
identify whether any of the allocated radio resources in the higher layer transmission period for the receiver entity are used by the transmitter entity for transmitting other data than the higher layer data for the receiver entity based on whether the transmitter entity conveys to the receiver entity during the higher layer data transmission period an indication of a subset of allocated radio resources used by the transmitter entity for the transmission of other data,
wherein the predefined signature sequence is selected by the transmitter entity from among a plurality of predefined signature sequences according to whether the transmission of the higher layer data to the receiver entity is a first transmission of the higher layer data to the receiver entity or a retransmission of the higher layer data to the receiver entity.
15. The receiver entity of claim 14 , wherein the predefined signature sequence is in a control channel region for the other data that is multiplexed along with a data channel for the other data into a data channel period of the allocation of radio resources in the higher layer data transmission period.
16. The receiver entity of claim 14 , wherein the receiver entity is further operable to:
receive reference symbols during the higher layer transmission period;
estimate channel conditions for the allocated radio resources; and
receive modified reference symbols provided for estimating channel conditions for the subset of allocated radio resources used for transmitting other data to indicate the subset of allocated radio resources used for the transmission of other data.
17. The receiver entity of claim 14 , wherein the receiver entity is further operable to:
receive the higher layer data into a plurality of higher layer data code blocks and applying error detection coding to individual higher layer data code blocks and an indication of the subset of allocated radio resources used for the transmission of other data; and
detect an error during decoding in respect of one or more of the higher layer data code blocks.
18. The receiver entity of claim 17 , wherein the error detection coding is based on a cyclic redundancy check process and/or wherein the error detection coding is based on a parity check process.
19. The receiver entity of claim 14 , wherein respective ones of the plurality of predefined signature sequences are associated with different amounts of radio resource, and the predefined signature sequence is selected by the transmitter entity from among the plurality of predefined signature sequences according to the amount of radio resources used for transmission of other data.
20. The receiver entity of claim 14 , wherein the receiver entity is further operable to:
receive higher layer data as a plurality of symbols and one or more data bits in one or more symbols carried on the subset of allocated radio resources set to a predetermined value.