Systems and methods for transmitting data information messages on a downlink of a wireless communication system
Embodiments are provide for communicating data or other non-control information messages within a downlink control channel directly, rather than in a data channel or broadcast channel. Thereby, radio resource utilization can be substantially improved in the cellular system, such as in the case of transmitting smaller data packets. In an embodiment, a transmitter arranges a set of time-frequency radio resources, associated with a downlink control channel, for transmitting information other than control information sent on the downlink control channel. The transmitter then sends, on the set of time-frequency radio resources, a data information message comprising the information other than the control information. The information other than the control information comprises one of user-specific data information and broadcast data information. A receiver then receives on the downlink control channel, control information and the data information message.
1. A method by a network component, the method comprising:
arranging a set of time-frequency radio resources, associated with a downlink control channel, for transmitting information other than control information sent on the downlink control channel; and
transmitting, on the set of time-frequency radio resources, a data information message comprising the information other than the control information, wherein the data information message has a size that is the same as a size of at least one of a transport block for a Physical Downlink Shared Channel (PDSCH) or a downlink control information (DCI) message transmitted on the downlink control channel, the size of the transport block being pre-determined according to a wireless communications standard, wherein the information other than the control information is user-specific data information, and wherein the method further comprises:
scrambling a Cyclic Redundancy Check (CRC) code using a dedicated user- specific Radio Network Temporary Identifier (RNTI):
encoding, using a superposition coding, the user-specific data information into a first data layer detectable within a coverage area and a second data layer comprising additional data; and
sending the scrambled CRC code with the user-specific data information in the data information message.
2. The method of claim 1 , further comprising transmitting control information on other time-frequency radio resources associated with the downlink control channel.
3. The method of claim 1 , wherein at least one time-frequency radio resource of the set of time-frequency radio resources is predefined to a receiver.
4. The method of claim 1 , wherein at least one time-frequency radio resource of the set of time-frequency radio resources is not predefined to a receiver.
5. The method of claim 1 further comprising signaling, to a receiver, at least one time-frequency radio resource of the set of time-frequency radio resources.
6. The method of claim 1 , wherein at least one time-frequency radio resource of the set of time-frequency radio resources is defined in a one of a user-specific search space for the downlink control channel and a common search space for the downlink control channel.
7. The method of claim 1 , wherein the information other than the control information comprises one of user-specific data information and broadcast data information.
8. The method of claim 7 , wherein transmitting, on the set of time-frequency radio resources, the information other than the control information comprises one of sending the user-specific data information in a transport block and sending the broadcast data information in at least a portion of a Master Information Block (MIB).
9. The method of claim 1 , wherein the downlink control channel is one of a Physical Downlink Control Channel (PDCCH) and an Enhanced PDCCH (EPDCCH), and wherein the set of time-frequency radio resources corresponds to Control Channel Elements (CCEs) or Enhanced CCEs (ECCEs).
10. The method of claim 1 , wherein the dedicated user-specific RNTI is a cell-RNTI that is user-specific.
11. The method of claim 1 ,further comprising computing the CRC using a specific polynomial associated with the data information message.
12. The method of claim 1 , further comprising implementing one of a specific interleaving and a specific scrambling associated with the data information message prior to computing the CRC.
13. The method of claim 1 , wherein the data information message includes at least one predefined bit that is set to a predefined value distinguishing the data information message from a control information message.
14. The method of claim 1 further comprising indicating, via higher layer signaling to a receiver, which part of the data information message the receiver should receive.
15. The method of claim 1 , wherein the information other than the control information is broadcast information, and wherein the method further comprises:
scrambling a Cyclic Redundancy Check (CRC) code using a broadcast Radio Network Temporary Identifier (RNTI); and
sending the scrambled CRC code with the broadcast information in the data information message.
16. The method of claim 15 , wherein the broadcast RNTI is pre-defined and known to a plurality of receivers.
17. The method of claim 15 , wherein the data information message is transmitted over a plurality of subframes by a plurality of transmissions.
18. The method of claim 17 further comprising scrambling the data information message by a sequence corresponding to the subframes.
19. The method of claim 15 , wherein the scrambling is in accordance with a cell-specific scrambling sequence applied to the data information message.
20. The method of claim 1 further comprising encoding the data information message by convolutional codes or by block codes.
21. The method of claim 1 further comprising modulating the data information message with a Phase Shift Keying (PSK) scheme.
22. The method of claim 1 , wherein the network component is one of a base station and a relay node.
23. A network component comprising:
at least one processor; and
a non-transitory computer readable storage medium storing programming for execution by the at least one processor, the programming including instructions to:
arrange a set of time-frequency radio resources associated with a downlink control channel for transmitting information other than control information sent on the downlink control channel; and
transmit, on the set of time-frequency radio resources, a data information message comprising the information other than the control information, wherein the data information message has a size that is the same as a size of at least one of-a transport block for a Physical Downlink Shared Channel (PDSCH) or a downlink control information (DCI) message transmitted on the downlink control channel, the size of the transport block being pre-determined according to a wireless communications standard; and
wherein the information other than the control information is user-specific data information, and the programming includes further instructions to:
scramble a Cyclic Redundancy Check (CRC) code using a dedicated user- specific Radio Network Temporary Identifier (RNTI);
encode, using a superposition coding, the user-specific data information into a first data layer detectable within a coverage area and a second data layer comprising additional data; and
send the scrambled CRC code with the user-specific data information in the data information message.
24. The network component of claim 23 , wherein the network component corresponds to one of an Evolved Universal Terrestrial Radio Access (E-UTRA) communications network and a Long Term Evolution (LTE) communications network.
25. A method, comprising:
transmitting, by a network component and on one or more first time-frequency radio resources associated with a downlink control channel, a user-specific data information message comprising non-control information; and
transmitting, by the network component, control information on one or more second time-frequency radio resources that are associated with the downlink control channel and that are different from the one or more first time-frequency radio resources;
wherein the user-specific data information message has a size that is the same as a size of at least one of a transport block for a Physical Downlink Shared Channel (PDSCH) or a downlink control information (DCI) message transmitted on the downlink control channel, the size of the transport block being pre-determined according to a wireless communications standard, wherein the non-control information is user-specific data information, and wherein the method further comprises:
scrambling a Cyclic Redundancy Check (CRC) code using a dedicated user- specific Radio Network Temporary Identifier (RNTI);
encoding, using a superposition coding, the user-specific data information into a first data layer detectable within a coverage area and a second data layer comprising additional data: and
sending the scrambled CRC code with the user-specific data information in the user-specific data information message.
26. The method of claim 25 , further comprising determining the one or more first time-frequency radio resources prior to the transmitting the user-specific data information message.
27. The method of claim 25 , wherein the method further comprises scrambling a Cyclic Redundancy Check (CRC) code using a dedicated user-specific Radio Network Temporary Identifier (RNTI); and
wherein the transmitting the user-specific data information message comprises sending the scrambled CRC code with user-specific data information in the user-specific data information message.
28. A device, comprising:
transmitter;
at least one processor; and
a non-transitory computer readable storage medium storing programming for execution by the at least one processor, the programming including instructions to:
cause the transmitter to transmit, on one or more first time-frequency radio resources associated with a downlink control channel, a user-specific data information message comprising non-control information; and
cause the transmitter to transmit control information on one or more second time-frequency radio resources that are associated with the downlink control channel and that are different from the one or more first time-frequency radio resources;
wherein the data information message has a size that is the same as a size of at least one of a transport block for a Physical Downlink Shared Channel (PDSCH) or a downlink control information (DCI) message transmitted on the downlink control channel, the size of the transport block being pre-determined according to a wireless communications standard;
wherein the non-control information is user-specific data information, and the programming includes further instructions to:
scramble a Cyclic Redundancy Check (CRC) code using a dedicated user- specific Radio Network Temporary Identifier (RNTI);
encode, using a superposition coding, the user-specific data information into a first data layer detectable within a coverage area and a second data layer comprising additional data; and
send the scrambled CRC code with the user-specific data information in the user-specific data information message.
29. The device of claim 28 , wherein the programming further includes instructions to determine the one or more first time-frequency radio resources prior to causing the transmitter to transmit the user-specific data information message.
30. The device of claim 28 , wherein the programming further includes instructions to scramble a Cyclic Redundancy Check (CRC) code using a dedicated user-specific Radio Network Temporary Identifier (RNTI); and
wherein the instructions to cause the transmitter to transmit the user-specific data information message comprises instructions to send the scrambled CRC code with user-specific data information in the user-specific data information message.