RU2011148510A

RU2011148510A - METHODS AND SYSTEMS FOR CSI-RS RESOURCE DISTRIBUTION IN LTE DEVELOPMENT SYSTEMS

Info

Publication number: RU2011148510A
Application number: RU2011148510/07A
Authority: RU
Inventors: Вэньфэн ЧЖАН
Original assignee: ЗедТиИ (ЮЭсЭй) ИНК.
Priority date: 2010-08-16
Filing date: 2011-08-16
Publication date: 2013-06-10

Claims

1. A method for transmitting a reference channel state information signal (CSI-RS), comprising:

identifying the position of one or more subframes where one or more CSI-RS reuse combinations are transmitted;

identifying the position of one or more resource elements (REs) used for CSI-RS transmission within the CSI-RS subframe, wherein REs that contain a combination of CSI-RS reuse are specified by the number of CSI-RS ports (N _ANT or N _CSIRS ) and position RE # 0 (<k _{r, 0} , l _{r, 0} > or

) in a combination of reuse;

providing the position of one or more subframes and one or more REs where the CSI-RS reuse combination is transmitted to one or more pieces of user equipment (UE); and

generating CSI-RS modulation symbols in one or more CSI-RS REs, where each symbol contains an element (

) CSI-RS sequences as a multiplication component.

2. The method according to claim 1, in which the subframe instances that transmit the CSI-RS are defined by an index n _{f of the} frame and an index n _s (0≤n _s <20) of a slot that satisfies (10 × n _f +

−Δ _csirs ) modT _CSIRS = 0, where T _CSIRS and Δ _{CSIRS are} signaled to the UE by the upper layer radio resource control (RRC) parameter I _CSIRS based on a predetermined table.

3. The method according to claim 1, wherein the number of CSI-RS ports (N _ANT or N _CSIRS ) and position RE # 0 (<k _{r, 0} , l _{r, 0} > or

) in a reuse combination, CSI-RS is encoded separately.

4. The method according to claim 3, in which the number of CSI-RS ports (N _ANT ) is encoded in 2 bits, the 2-bit binary combination = 01 for N _ANT = 2, 10 for N _ANT = 4 and 11 for N _ANT = 8.

5. The method according to claim 3, in which the position of RE # 0 (<k _{r, 0} , l _{r, 0} > or

) encode in

bits based on a table of 4 × N8Tx entries that include all CSI-RS RE positions for all 8-Tx CSI-RS reuse combinations whose RE indices are even numbers, where N _8Tx is equal to the number of all 8-Tx reuse combinations using CSI-RS.

6. The method according to claim 3, in which:

the position RE # 0 (<k _{r, 0} , l _{r, 0} >) for m-Tx (m = N _ANT ) of the CSI-RS reuse combination is equal to the position RE # z (<k _{r, z} , l _{r, z} >) a nested 8-Tx CSI-RS reuse combination for z = m × f (x, m), where f (x, m)

{0,1,2,3}; and

bits are used to encode the position RE # 0 <k _{r, 0} , l _{r, 0} > of the embedded 8-Tx CSI-RS reuse combination, based on a predefined table with N _8Tx entries.

7. The method according to claim 6, in which x is an RRC-signaled parameter and f (x, m) = x

{0,1,2,3} requires 2 more signaling bits for x.

8. The method according to claim 1, in which

the assigned <k _{r, 0} , l _{r, 0} > for m-Tx (m = N _ANT ) reuse combinations is equal to <k _{r, z} , l _{r, z} > (position RE # z) of the nested 8-Tx reuse combination uses where z and N _ANT code together; and

bits are used to encode the position RE # 0 <k _{r, 0} , l _{r, 0} > of the nested 8-Tx reuse combination based on a predetermined table with N _8Tx entries.

9. The method according to PP.5-7 or 8, in which

N _8Tx = { 8 regular CP 7 advanced CP.

10. The method according to claim 1, in which

the relation between the index (m ') of the element (

) of the CSI-RS sequence and the index (m) of the PRB frequency domain containing the CSI-RS RE onto which the CSI-RS sequence element is mapped has the form m '= m +

where

is the actual frequency band of the system, including PRB and

is the maximum supported frequency band in the number of PRBs, and the transmitted CSI-RS sequence segment

determined by the index of the sequence element

m '=

,

+ 1, ...,

+

-one.

11. A method for suppressing a physical downlink shared channel (PDSCH) associated with transmitting a channel status information reference signal (CSI-RS), the method comprising:

informing the user equipment (UE) of one or more sets of positions and attributes of the resource element (RE) using a physical resource block (PRB), each set of positions RE is a subset of the RE CSI-RS.

12. The method according to claim 11, further comprising:

suppression of two PDSCH REs, if both of them occupy the same two RE positions as the CSI-RS RE-multiplexed code division multiplexed (CDM) pair indexed with <2j, 2j + l> within the informed RE position sets.

13. The method according to claim 11, in which two REs do not suppress if one of the two REs occupies the same two RE positions as the pair of CDI RE CSI-RSs indexed with <2j, 2j + 1> within the informed sets RE positions that carry a signal other than PDSCH.

14. The method of claim 11, wherein the attributes associated with each set of suppressed REs comprise:

subframe instances where the set RE is suppressed; and

partial suppression parameter for partial suppression in a cell region, a time domain, a frequency domain or a spatial region.

15. The method of claim 14, wherein the subframe instances for a given set of suppressed REs are specified by an index n _{f of the} frame and an index n _s (0≤n _s <20) of a slot that satisfies (10 × n _f +

-Δ _muting ) modT _muting = 0, where T _muting and Δ _muting , which signal to the UE through the upper layer I _muting RRC parameter, based on a predetermined table.

16. The method according to claim 11, in which each set of suppressed REs is directly signaled to the UE, as the actual combination of CSI-RS reuse assigned to each interfered cell with the same signaling format that indicates each cell in the CSI-RS measurement set.

17. The method according to 14, further comprising implementing partial suppression in a cell region by allowing suppression in at least one cell and inhibiting suppression in cells that have not been suppressed, the partial suppression attribute being required neither for suppression nor for non-suppression.

18. A system configured to receive a channel status information reference signal (CSI-RS), comprising:

one or more subframes within a physical resource block (PRB), wherein the subframes contain one or more combinations of CSI-RS reuse;

one or more resource elements (REs) used for CSI-RS transmission within the CSI-RS subframe, wherein REs that contain CSI-RS reuse combinations are specified by the number of CSI-RS ports (N _ANT or N _CSIRS ) and position RE # 0 (<k _{r, 0} , l _{r, 0} > or

) in a combination of reuse;

a user equipment (UE), wherein the UE comprises position information related to one or more subframes and one or more REs; and

CSI-RS modulation symbols configured to transmit on one or more REs within one or more subframes, where each CSI-RS symbol contains an element

CSI-RS sequences as a component of multiplication.

19. The system of claim 18, wherein the subframe instances are specified by frame index n _f and index n _s that satisfy (10 × n _f +

−Δ _CSIRS ) modT _CSIRS = 0, where T _CSIRS and Δ _{CSIRS are} signaled to the UE by the upper layer radio resource control (RRC) parameter ICSIRS based on a predetermined table.

20. The system of claim 18, wherein the number of CSI-RS ports (N _ANT or N _CSIRS ) and position RE # 0 (<k _{r, 0} , l _{r, 0} > or

) in a reuse combination, CSI-RS is encoded separately.

21. The system of claim 20, wherein the number of CSI-RS ports (N _ANT ) is encoded in 2 bits, the 2-bit binary combination = 01 for N _ANT = 2, 10 for N _ANT = 4, and 11 for N _ANT = 8.

22. The system of claim 20, wherein the position is RE # 0 (<k _r , ₀ , l _r , ₀ > or

) encode in

bits based on a table of 4 × N _8Tx entries that include all CSI-RS RE positions for all 8-Tx CSI-RS reuse combinations whose RE indices are even numbers, where N _8Tx equals the number of all 8-Tx combinations Reuse CSI-RS.

23. The system of claim 22, wherein