Abstract
A method signals a modulation scheme to user equipment on a control channel in a communication system. The method includes encoding the modulation scheme on a modulation specifier and encoding a number of channelization codes on a code group indicator. When the modulation scheme is other than quadrature phase shift keying with the user equipment being configured to support 64-quadrature amplitude modulation (64-QAM) then set the modulation specifier to indicate that the applied modulation scheme is other than QPSK encode a code offset on a code offset indicator and set one bit of the code offset indicator to indicate that the applied modulation scheme is 64-QAM. Finally the method includes transmitting the modulation specifier the code group indicator and the code offset indicator on the control channel to the user equipment.
Technologies
Multiple access
Product
Use Cases
Wireless communication
Services
Claim
1. A method for a base station to signal a modulation scheme to a user equipment (UE) on a high speed shared control channel (HS-SCCH) in a high speed downlink packet access (HSPDA) communication system, the HS-SCCH carrying a modulation specifier (xms,1) comprising one bit information, a code group indicator (xccs,1,xccs,2, xccs,3) comprising three bit information, and a code offset indicator (xccs,4, xccs,5, xccs,6, xccs,7) comprising four bit information, the method comprising:
setting the modulation specifier (xms,1) to �0� if the modulation scheme is Quadrature Phase Shift Keying (QPSK);
setting the modulation specifier (xms,1) to �1� if the modulation scheme is other than QPSK;
determining a number of channelization codes (P), a code offset, and a control channel index (I), such that P, O and I fulfills a relation |O?1??P/8?*15|mod 2 =(I) mod 2;
encoding the number of channelization codes (P) on the code group indicator (xccs,1, xccs,2, xccs,3) using an unsigned binary representation of integers calculated by an expression according to xccs,1, xccs,2, xccs,3=min(P?1,15?P), where xccs,1 is a most significant bit;
when the UE is not configured for 64-Quadrature Amplitude Modulation (64-QAM), or when the UE is configured for 64-QAM and the modulation specifier (xm,1) is set to �0�,
encoding a code offset (O) on the code offset indicator (xccs,4, xccs,5, xccs,6, xccs,7) using an unsigned binary representation of integers calculated by an expression according to (xccs,4, xccs,5, xccs,6, xccs,7=|O?1??P/8?*15|, where xccs,4 is a most significant bit and xccs,7 is a least significant bit;
when the UE is configured for 64-QAM and the modulation specifier (xms,1) is set to �1�,
encoding the code offset (O) on the code offset indicator (xccs,4, xccs,5, xccs,6) using an unsigned binary representation of integers calculated by an expression according to xccs,4, xccs,5, xccs,6, xccs,dummy=|O?1??P/8?*15|, where Xccs,dummy is a dummy bit that is not transmitted on the HS-SCCH, and
encoding the least significant bit (xccs,7) of the code offset indicator based on the modulation scheme, wherein encoding the least significant bit comprises:
setting the least significant bit (xccs,7) of the code offset indicator to �0� when the modulation scheme is 16-quadrature amplitude modulation (16-QAM), and
setting the least significant bit (xccs,7) of the code offset indicator to �1� when the modulation scheme is 64-QAM; and
transmitting the modulation specifier (xms,1), the code group indicator (xccs,1, xccs,2, xccs,3), and the code offset indicator (xccs,4, xccs,5, xccs,6, xccs,7) on the HS-SCCH to the UE.
2. The method of claim 1, wherein the control channel index (I) is given by a position in a list of HS-SCCH channelization codes signaled by higher layers.
3. The method of claim 1, further comprising:
transmitting a message to the user equipment on a high speed downlink shared channel (HS-DSCH) using the modulation scheme, the number of channelization codes (P), and the code offset (O) as signaled on the HS-SCCH to the user equipment.
4. A method for a base station to signal a modulation scheme to a user equipment (UE) on a control channel in a communication system, the method comprising:
defining a set of unique pairs, wherein each unique pair has a code offset (O) and number of channelization codes (P);
partitioning the set into at least a first subset and a second subset, wherein the first subset contains at least one unique pair and the second subset contains at least another unique pair;
associating the set with a first modulation class, associating the first subset with a second modulation class, and associating the second subset with the second modulation class, wherein the second modulation class contains a first modulation type and a second modulation type; and
signaling, by the base station to the UE, a modulation class and a pair associated with the modulation class and one of the first modulation type and the second modulation type.
5. The method of claim 4, wherein the signaling comprises:
using a control channel index (I) to signal a subset.
6. The method of claim 5, wherein an even-numbered control channel index (I) indicates the first subset and an odd-numbered control channel index (I) indicates the second subset.
7. The method of claim 4, wherein the first subset and the second subset are disjoint.
8. The method of claim 4, wherein the first modulation class is Quadrature Phase Shift Keying (QPSK) and the second modulation class is a combination of 16-Quadrature Amplitude Modulation (16-QAM) and 64-Quadrature Amplitude Modulation (64-QAM).
9. The method of claim 4, wherein the first modulation type is 16-Quadrature Amplitude Modulation (16-QAM) and the second modulation type is 64- Quadrature Amplitude Modulation (64-QAM).
10. The method of claim 4, further comprising:
transmitting data to the user equipment using the modulation class, modulation type, and channelization codes identified by the pair.
11. A method for a user equipment to decode a signaled modulation scheme on a high speed shared control channel (HS-SCCH) in a high speed downlink packet access (HSDPA) communication system, the HS-SCCH carrying a modulation specifier (xms,1) comprising one bit information, a code group indicator (xccs,1, xccs,2, xccs,3) comprising three bit information, and a code offset indicator (xccs,4, xccs,5, xccs,6, xccs,7) comprising four bit information, the method comprising:
receiving the modulation specifier (xms,1), the code group indicator(xccs,1, xccs,2, xccs,3), and the code offset indicator (xccs,4, xccs,5, xccs,6, xccs,7) on the HS-SCCH from a base station;
examining the modulation specifier;
determining that the applied modulation scheme is quadrature phase shift keying (QPSK) if the modulation specifier is �0�;
determining that the applied modulation scheme is other than QPSK if the modulation specifier is �1�;
when the applied modulation scheme is determined to be QPSK,
decoding a number of channelization codes (P) from the code group indicator and decoding a code offset (O) from the code offset indicator; and
when the applied modulation scheme is determined to be other than QPSK,
examining the least significant bit (xccs,7) of the code offset indicator to determine whether the modulation scheme is 64-quadrature amplitude modulation (64-QAM), and
when the determined modulation scheme is 64-QAM,
generating a replacement least significant bit (LSB) of the code offset indicator based on a HS-SCCH number (I) using an unsigned binary representation of integers calculated by an expression according to xccs,7=mod(I,2) to create a modified code offset indicator, and
determining the number of channelization codes (P) from the code group indicator and decoding the code offset (O) from the modified code offset indicator.
12. The method of claim 11, wherein the decoding the number of channelization codes (P) from the code group indicator and decoding the code offset (O) from the code offset indicator comprises:
using a pair of complementary look up tables containing all valid combinations of the number of channelization codes (P) and the code offset (O) for even numbered control channel indexes and odd numbered control channel indexes.
13. The method of claim 11, when the applied modulation scheme is determined to be other than QPSK, further comprising:
examining the least significant bit (xccs,7) of the code offset indicator to determine whether the modulation scheme is 16-quadrature amplitude modulation (16-QAM); and
when the determined modulation scheme is 16-QAM,
generating the replacement least significant bit (LSB) of the code offset indicator based on the HS-SCCH number (I) using an unsigned binary representation of integers calculated by an expression according to xccs,7=mod(I,2) to create the modified code offset indicator, and
decoding the number of channelization codes (P) from the code group indicator and decoding the code offset (O) from the modified code offset indicator.
14. A method for a user equipment to decode a signaled modulation scheme on a high speed shared control channel (HS-SCCH) in a high speed downlink packet access communication system, the HS-SCCH carrying a modulation specifier, a code group indicator, and a code offset indicator, the method comprising:
receiving the modulation specifier, the code group indicator, and the code offset indicator on the high speed shared control channel from a base station;
determining the modulation scheme applied by the base station using the modulation specifier; and
when the modulation scheme is determined to be other than quadrature phase shift keying (QPSK),
examining a predetermined bit of the code offset indicator to determine that the applied modulation scheme is 64-quadrature amplitude modulation (64-QAM); and
when the modulation scheme is determined to be QPSK,
decoding the code group indicator to obtain the number of channelization codes (P) and decoding the code offset indicator to obtain the code offset (O).
15. The method of claim 14, further comprising:
generating a replacement bit for the predetermined bit using a channel number (I).
16. The method of claim 15 wherein the generating comprises:
replacing the predetermined bit with an unsigned binary representation of integers calculated by an expression according to mod (I,2).
17. The method of claim 14, further comprising:
obtaining a number of channelization codes (P) from the code group indicator and obtaining a code offset (O) from the code offset indicator.
18. The method of claim 17, wherein the obtaining comprises:
using a pair of complementary look up tables containing all valid combinations of the number of channelization codes (P) and the code offset (O) for even and odd HS-SCCH channel numbers.
19. The method of claim 14, further comprising:
examining the predetermined bit of the code offset indicator to determine that the modulation scheme is 16-quadrature amplitude modulation (16-QAM).
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Note:
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.