Granted Patent B2

US 8,705,463 · App. 12/819,924 · Granted Apr 22, 2014

Abstract

Claims (33)

1. A method for identifying a reference signal pattern in contiguous resource blocks received by a user agent (UA) in a wireless communication system where any of one through N contiguous resource blocks may be assigned to a UA, the method performed by a UA and comprising the steps of:

storing resource block reference signal patterns in a UA memory where the patterns include a separate reference signal pattern for each possible number of contiguous resource blocks that may be assigned to a UA;

receiving a resource grant indicating a number of contiguous resource blocks are assigned to the UA;

based on the number of contiguous resource blocks assigned to the UA, identifying one of the reference signal patterns in the memory; and

using the identified one of the reference signal patterns to identify reference signals in contiguously received resource blocks.

2. The method of claim 1 wherein, for two or more contiguous resource blocks the reference signal pattern is symmetrical.

3. A method for distributing reference signals in first and second resource blocks (RBs) of a wireless communication channel, the first and second RBs each including a plurality of resource elements (REs), being contiguous along at least one of a frequency domain and a time domain, and having a geometrical center of a physical downlink shared channel (PDSCH) region, the method comprising the steps of:

allocating a plurality of the REs of the first RB to the reference signal at first relative locations within the at least one of the frequency domain and the time domain;

allocating a plurality of the REs of the second RB to the reference signal at second relative locations within the at least one of the frequency domain and the time domain, the second relative locations being different than the first relative locations, the allocated REs of the first and second RBs having a center of symmetry equal to the geometrical center of the PDSCH regions of the first and second RBs combined; and

transmitting the first and second RBs using the wireless communication channel.

4. The method of claim 3 , wherein the reference signal is a Dedicated Reference Signal (DRS).

5. The method of claim 3 , wherein the step of allocating a plurality of the REs of the second RB to the reference signal includes the steps of:

reflecting a position of a first allocated RE on the first RB about a center point of the PDSCH regions of the first and the second RBs combined and

allocating a first RE on the second RB to the reference signal, a position of the first RE on the second RB being equal to the reflected position of the first RE on the first RB.

6. The method of claim 3 , wherein the step of allocating a plurality of the REs of the second RB to the reference signal includes the step of, for each of the allocated REs on the first RB, allocating an RE on the second RB to the reference signal, a position of the RE allocated on the second RB being a two-dimensional point reflection of a position of the allocated RE on the first RB.

7. The method of claim 3 , wherein the wireless communication channel utilizes a plurality of antenna ports and each of the allocated REs of the first and second RBs is assigned to one of the plurality of antenna ports.

8. The method of claim 3 , wherein the plurality of REs allocated to the reference signal for multiple antenna ports are configured for a wireless communication channel implementing at least one of Code-Division Multiplexing (CDM), Frequency-Division Multiplexing (FDM), and Time-Division Multiplexing (TDM).

9. The method of claim 3 , including the steps of:

allocating a plurality of REs of a third RB to the reference signal, the plurality of the allocated REs of the third and second RBs having a center of symmetry equal to a geometrical center of the PDSCH regions of the second and third RBs.

10. The method of claim 9 , wherein the step of allocating a plurality of the REs of the third RB to the reference signal includes the step of, for each of the allocated REs on the second RB, allocating an RE on the third RB to the reference signal, a position of the RE allocated on the third RB being a two-dimensional point reflection of the position of the allocated RE on the second RB.

11. A method for distributing reference signals in at least one resource block (RB) of a wireless communication channel utilizing a plurality of antenna ports, the RB including a plurality of resource elements (REs), the method comprising:

assigning an index (i) to each antenna port (p) of the plurality of antenna ports, wherein the indexes (i 1 , i 2 , . . . i n ) are assigned to the respective antenna ports (p 1 , p 2 , . . . p n ) in an ascending order of a sequence;

defining a set of candidate REs of the RB to be allocated for demodulation reference signals, the set of candidate REs being positioned within the RB in a plurality of rows, wherein each candidate RE in the set is positioned at a point of intersection for tow of the rows, the two rows comprising a row extending along a frequency domain and a row extending along a time domain, each of the two rows containing multiple candidate REs to be allocated for demodulation reference signals;

for candidate REs in a first row of the plurality of rows, assigning each of the candidate REs in the first row to one of the plurality of antenna ports in the sequence, wherein the candidate REs are assigned to the antenna ports in the ascending order of the respective indexes; and

transmitting the RB using the wireless communication channel.

12. The method of claim 11 , including the step of, when a total number of candidate REs in the first row is less than a total number of the plurality of antenna ports, assigning candidate REs in a second row of the plurality of rows one of the plurality of antenna ports in the sequence starting at the antenna port assigned an index corresponding to the total number of candidate REs in the first row plus 1 candidate RE.

13. The method of claim 11 , including the step of, when a total number of the plurality of antennas ports is a multiple of a total number of candidate REs in each of the plurality of rows, offsetting the index of each of the plurality of antenna ports by one, wherein the offsetting occurs after assigning candidate REs to each antenna port in the sequence.

14. The method of claim 11 , wherein each row of the set of candidate REs extends through the frequency domain of the RB.

15. The method of claim 11 , wherein each row of the set of candidate REs extends through the time domain of the RB.

16. A method for configuring a dedicated reference signal (DRS) pattern in a plurality of contiguous resource blocks (RBs) used in a wireless communication system, the method comprising:

specifying a single RB DRS pattern;

using the single RB DRS pattern to derive a DRS pattern for a plurality of contiguous RBs that are assigned to a single user agent (UA), wherein the DRS pattern for each adjacent pair of RBs in the plurality is different, wherein each RB in a pair of contiguous RBs comprises resource elements allocated for DRSs, the allocated resource elements having a center of symmetry located at a geometric center of a physical downlink shared channel (PDSCH) region of the RBs; and

transmitting an RB containing the single RB DRS pattern using the wireless communication channel.

Assignments (10)