Abstract
A method and a radio base station for interleaving control channel data to be transmitted in a telecommunications system are described. The method comprises grouping the control channel elements CCE 1-CCEn into a first order of control channel symbol groups adding symbol groups comprising dummy values or zeros to the first order of control channel symbol groups based on a number of available symbol group positions for the shared control channel interleaving the first order of the control channel symbol groups resulting in an a second order and mapping the second order of control channel symbol groups to the available control channel transmission resources.
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| 5G | 19/05/2017 | ISLD-201704-018 | ERICSSON INC | No | Family Member | ||||
Specification Information
Specification Information
Technologies
Family Information
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| Publication No | Technology | Declaration Information | Specification Information | Explicitly Disclosed | Patent Type | Status | National Phase Entries | |||||
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Technologies
Resource configuration
Product
Base Station (eNB/gNB)
Use Cases
Wireless communication
Services
Transmitting/receiving of control channel/control information
Claim
1. A method for randomization of interference experienced by a shared control channel transmitted using control channel transmission resources from a base station where the shared control channel comprises control channel elements CCE1-CCEn, comprising:
grouping the control channel elements CCE1-CCEn into a first order of control channel symbol groups;
adding symbol groups comprising dummy values or zeros to the first order of control channel symbol groups based on a number of available symbol group positions for the shared control channel;
interleaving the first order of the control channel symbol groups resulting in a second order of the control channel symbol groups; and
mapping the second order of control channel symbol groups to the available control channel transmission symbol group positions.
2. The method of claim 1:
wherein the transmission resources comprise a number of Orthogonal Frequency Division Multiplexing (OFDM) symbols and OFDM subcarriers; and
wherein the number of available symbol group positions of the control channel transmission resources are determined based on a number of OFDM symbols and OFDM subcarriers used for the control channel transmission resources.
3. The method of claim 1, wherein the mapping comprises mapping sequentially over frequencies within the symbol group positions followed by mapping sequentially over OFDM symbols within the symbol group positions.
4. The method of claim 1, wherein the mapping comprises mapping sequentially over OFDM symbols within the symbol group positions followed by mapping sequentially over frequencies within the symbol group positions.
5. The method of claim 1, wherein the mapping comprises mapping sequentially with respect to symbol groups within resource blocks of the control channel transmission resources.
6. The method of claim 5, wherein the mapping comprises mapping sequentially over frequencies within the resource block followed by mapping sequentially over OFDM symbols within the resource block.
7. The method of claim 5, wherein the mapping comprises mapping sequentially over OFDM symbols within the resource block followed by mapping sequentially over frequencies within the resource block.
8. The method of claim 1, wherein the interleaving is Quadratic Permutation Polynomials (QPP) based interleaving.
9. The method of claim 8, wherein the QPP based interleaving comprises:
establishing the minimum value of a parameter K in a predefined look-up table such that K?NSG , where NSG is the number of available symbol group positions of the control channel transmission resources;
selecting a further set of parameters (f1,f2,i) based on the value K in the look-up table; and
computing interleaving address values of the thus selected QPP interleaver by applying the parameter values (K,f1,f2,i) in the formula:
?(i)=(f 1 �i+f 2 �i 2)mod K
where:
K=length,
f1 and f2=polynomial coefficients,
i=output index, and
?(i)=input index.
10. The method of claim 9, wherein the computing further comprises, if K>NSG, truncating any resulting interleaving address values higher than NSG?1.
11. The method of claim 1, wherein the interleaving is cell-specific linear interleaving.
12. The method of claim 11, wherein the cell-specific linear interleaving is computed with a cell-specific prime number P.
13. The method of claim 12, wherein the interleaving is a cyclic sampling of the first order by the cell specific prime number P, where the cell-specific primer number P is not a factor of the number of symbol group positions.
14. The method of claim 12, wherein the cell-specific prime number chosen is limited to prime numbers that provide sufficient frequency diversity as determined by a numerical distance value between symbol groups that is above a certain threshold value.
15. The method of claim 1, wherein the adding comprises:
appending or prepending and/or otherwise combining symbol groups comprising dummy values or zeros to the first order of control channel symbol groups.
16. A radio base station configured for randomization of interference experienced by a shared control channel transmitted by using control channel transmission resources from the base station, where the shared control channel comprises control channel elements CCE1-CCEn, and where the base station comprises:
a first processing circuit configured to group the control channel elements CCE1-CCEn into a first order of control channel symbol groups;
a second processing circuit configured to add symbol groups comprising dummy values or zeros to the first order of control channel symbol groups based on a number of available symbol group positions for the shared control channel;
a third processing circuit configured to interleave the first order of the control channel symbol groups resulting in an a second order for the control channel symbol groups; and
a fourth processing circuit configured to map the second order of control channel symbol groups to the available control channel transmission symbol group positions.
17. The base station of claim 16:
wherein the transmission resources comprise a number of Orthogonal Frequency Division Multiplexing (OFDM) symbols and OFDM subcarriers; and
wherein the determining is based on a number of OFDM symbols and OFDM subcarriers used for the control channel transmission resources.
18. The base station of claim 16, wherein the fourth processing circuit is further configured to:
map sequentially over frequencies within the symbol group positions; and then
map sequentially over OFDM symbols within the symbol group positions.
19. The base station of claim 16, wherein the fourth processing circuit is further configured to:
map sequentially over OFDM symbols within the symbol group positions; and then
map sequentially over frequencies within the symbol group positions.
20. The base station of claim 16, wherein the fourth processing circuit is further configured to:
map sequentially with respect to symbol groups within resource blocks of the control channel transmission resources.
21. The base station of claim 20, wherein the fourth processing circuit is further is configured to:
map sequentially over frequencies within the resource block; and then
map sequentially over OFDM symbols within the resource block.
22. The base station of claim 20, wherein the fourth processing circuit is further configured to:
map sequentially over OFDM symbols within the resource block; and then
map sequentially over frequencies within the resource block.
23. The base station of claim 16, wherein the interleaving is Quadratic Permutation Polynomials (QPP) based interleaving.
24. The base station of claim 23, wherein the third processing circuit is further configured to:
establish the minimum value of a parameter K in a predefined look-up table such that K?NSG where NSG number of available symbol group positions of the control channel transmission resources;
select a further set of parameters (f1,f2,i) based on the value K in the look-up table; and
compute interleaving address values of the thus selected QPP interleaver by applying the parameter values (K,f1,f2,i) in formula:
?(i)=(f 1 �i+f 2 �i 2)mod K
where:
K=length,
f1 and f2=polynomial coefficients,
i=output index, and
?(i)=input index.
25. The base station of claim 24, wherein the third processing circuit is further configured to, if K?NSG, truncate any resulting interleaving address values higher than NSG?1.
26. The base station of claim 16, wherein the interleaving is cell-specific linear interleaving.
27. The base station of claim 26, wherein the cell-specific linear interleaving is computed with a cell-specific prime number P.
28. The base station of claim 27, wherein the cell-specific linear interleaving is a cyclic sampling of the first order by the cell specific prime number P, where the cell specific primer number P is not a factor of the number of symbol group positions.
29. The base station of claim 27, wherein the cell-specific prime number chosen is limited to prime numbers that provide sufficient frequency diversity as determined by a numerical distance value between symbol groups that is above a certain threshold value.
30. The base station of claim 16, wherein the second processing circuit is further configured to:
append or prepend and/or otherwise combine symbol groups comprising dummy values or zeros to the first order of control channel symbol groups.
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The information in blue was extracted from the third parties (Standard Setting Organisation, Espacenet)
The information in grey was provided by the patent holder
The information in purple was extracted from the FrandAvenue
Explicitly disclosed patent:openly and comprehensibly describes all details of the invention in the patent document.
Implicitly disclosed patent:does not explicitly state certain aspects of the invention, but still allows for these to be inferred from the information provided.
Basis patent:The core patent in a family, outlining the fundamental invention from which related patents or applications originate.
Family member:related patents or applications that share a common priority or original filing.