Network node and method performed therein for generating a radio interference mitigation reference signal sequence
A method and network node for scrambling radio interference mitigation reference signals (RIM-RS) are disclosed. According to one aspect, a network node is configured to generate an initialization seed computed by linearly combining a function of a time counter t and a function of a scrambling identifier, N ID . The network node is further configured to generate a radio interference mitigation reference signal (RIM-RS) sequence based at least in part on the initialization seed.
1. A network node for enabling mitigation of remote interference from another network node to communications between the network node and a wireless device (WD), the network node comprising processing circuitry configured to:
generate an initialization seed as a function of a time counter t and a scrambling identifier N ID , the initialization seed computed by linearly combining, in a modulo 2 sense, a function of only the time counter t and a function of only the scrambling identifier N ID , such that bits dependent on t and bits dependent on N ID are placed on separate parts of a bit field of the initialization seed; and
generate a remote interference mitigation reference signal (RIM-RS) sequence based at least in part on the initialization seed.
2. The network node of claim 1 , wherein the initialization seed fits into a 31-bit linear feedback sequence register associated with a length 31 Gold sequence generator.
3. The network node of claim 2 , wherein the time counter t is a counter of RIM-RS transmission occasions.
4. The network node of claim 2 , wherein the function of the time counter t is based on a parameter Z chosen to shift the initialization seed.
5. The network node of claim 2 , wherein the network node is further configured to transmit, based on or using the generated RIM-RS sequence, a RIM-RS for reception by the another network node.
6. The network node of claim 1 , wherein the time counter t is a counter of RIM-RS transmission occasions.
7. The network node of claim 1 , wherein the function of the time counter t is based on a parameter Z chosen to shift the initialization seed.
8. The network node of claim 7 , wherein the parameter Z chosen to shift the initialization seed is a prime number.
9. The network node of claim 1 , wherein the network node is further configured to transmit, based on or using the generated RIM-RS sequence, a RIM-RS for reception by the another network node.
10. A method implemented in a network node for enabling mitigation of remote interference from another network node to communication between the network node and a wireless device (WD), the method comprising:
generating an initialization seed as a function of a time counter t and a scrambling identifier N ID , the initialization seed computed by linearly combining, in a modulo 2 sense, a function of only the time counter t and a function of only the scrambling identifier N ID , such that bits dependent on t and bits dependent on N ID are placed on separate parts of a bit field of the initialization seed; and
generating a remote interference mitigation reference signal (RIM-RS) sequence based at least in part on the initialization seed.
11. The method of claim 10 , wherein the initialization seed fits into a 31-bit linear feedback sequence register associated with a length of 31 Gold sequence generator.
12. The method of claim 11 , wherein the time counter t is a counter of RIM-RS transmission occasions.
13. The method of claim 11 , wherein the function of the time counter t is based on a parameter Z chosen to shift the initialization seed.
14. The method of claim 11 , further comprising transmitting, based on or using the generated RIM-RS sequence, a RIM-RS for reception by another network node.
15. The method of claim 10 , wherein the time counter t is a counter of RIM-RS transmission occasions.
16. The method of claim 10 , wherein the function of the time counter t is based on a parameter Z chosen to shift the initialization seed.
17. The method of claim 16 , wherein the parameter Z chosen to shift the initialization seed is a prime number.
18. The method of claim 17 , further comprising transmitting, based on or using the generated RIM-RS sequence, a RIM-RS for reception by another network node.
19. The method of claim 10 , further comprising transmitting, based on or using the generated RIM-RS sequence, a RIM-RS for reception by another network node.