Reference signal generation and determining reference signal resource allocation
Various embodiments include devices, methods, computer-readable media and system configurations for reference signal generation and resource allocation. In various embodiments, a wireless communication device may include a control module, which may be operated by a processor and configured to transmit to a user equipment (“UE”) device, over a wireless communication interface, a parameter specific to the UE device; wherein the parameter is usable by the eNB to generate a user equipment-specific reference signal (“UE-RS”) to be sent to the UE device. The parameter may be usable by the UE device to identify the UE-RS to facilitate demodulation of multiple-input, multiple-output communications. In various embodiments, a control module may be configured to store, in memory, priority rules, and to determine a UE-RS resource allocated to another UE device based on a UE-RS resource allocated to the UE device and the priority rules.
1. An evolved Node B (“eNB”) comprising:
a processor;
memory coupled to the processor; and
a control module to be operated by the processor and configured to transmit to a user equipment (“UE”) device, through downlink control information (“DCI”), an indication of a reference signal (“RS”) parameter value and a scrambling identity value that are to be used in conjunction with a physical cell layer identity, by the eNB, to determine an initialization value, Cinit, to generate a user equipment-specific reference signal (“UE-RS”) to be sent to the UE device, and the RS parameter value and the scrambling identity value are usable by the UE device to identify the UE-RS to facilitate demodulation by the UE device of multiple-input, multiple-output communications,
wherein the RS parameter value is a sub-cell identifier that is different from the physical cell layer identity and the scrambling identity value is determined by a single bit in the DCI.
2. The eNB of claim 1 , wherein the DCI is in an extended format of DCI 2C or is a format DCI 2D, and includes more than 3 bits to indicate the parameter.
3. The eNB of claim 2 , wherein the DCI is capable of indicating UE-RS ports 11 or 13 while also indicating a scrambling code identity (“SCID”) of 0 or 1.
4. The eNB of claim 1 , wherein the RS parameter value is included as a multi-bit channel state information-reference signal (“CSI-RS”).
5. The eNB of claim 1 , wherein the initialization value, c init , that is used by the eNB to generate the UE-RS is initialized using the following equation:
c init =(└ n s /2┘+1)×(2 N ID cell +1)×2 16 +CSI-RS ID ×2 8 +n SCID
wherein CSI-RS ID is the RS parameter value, n s is a slot number in a radio frame, N ID cell is a physical cell layer identity, and n SCID is the scrambling identity value.
6. The eNB of claim 1 , further comprising a wireless communication interface.
7. A computer-implemented method, comprising:
generating, by an evolved Node B (“eNB”), a user equipment-specific reference signal (“UE-RS”) based on an initialization value, Cinit, determined using a reference signal (“RS”) parameter value, a physical cell layer identity, and a scrambling code identity, wherein the UE-RS is usable by a UE device to facilitate demodulation by the UE device of multiple-input, multiple-output communications;
transmitting, by the eNB, an indication of the RS parameter value and the scrambling code identity to the UE device, over a wireless communication interface, using downlink control information (“DCI”),
wherein the RS parameter value is a sub-cell identifier that is different from the physical cell layer identity and the scrambling code identity is determined by a single bit in the DCI; and transmitting the UE-RS.
8. The method of claim 7 , wherein the DCI is an extension of DCI format 2C or is a DCI format 2D and includes more than 3 bits.
9. The method of claim 8 , wherein the DCI is capable of indicating UE-RS ports 11 or 13 while also indicating a scrambling code identity (“SCID”) of 0 or 1.
10. The method of claim 7 , wherein transmitting the RS parameter value to the UE device comprises transmitting the RS parameter value as a multi-bit channel state information-reference signal (“CSI-RS”).
11. The method of claim 7 , further comprising initializing a pseudo-random sequence generator using the following equation:
(└ n s /2┘+1)×(2 N ID cell +1)×2 16 +CSI-RS ID ×2 8 +n SCID
wherein ns is a slot number in a radio frame, N cell ID is a physical cell layer identity and n SCID is the scrambling code identity, and CSI-RS ID is the RS parameter value.
12. The eNB of claim 1 , wherein the memory comprises dynamic random access memory (“DRAM”) that stores instructions to implement the control module.