HSDPA system with reduced inter-user interference

A method further of transmitting data from a radio network to a plurality of user equipment devices, the method comprising:

• transmitting from the radio network to a first user equipment device of the plurality of user equipment devices a first type of control information relating to a time transmission interval (TTI), the first type of control information comprising indications of code allocation and modulation technique of transmission of payload data to the first user equipment device during the TTI;
• sending a message from the radio network to each of the plurality of user equipment devices, the message comprising a second type of control information, the second type of control information comprising information regarding code allocation and modulation technique of transmission of payload data to at least a second user equipment device of the plurality of user equipment devices during the TTI, the second user equipment device being different from the first user equipment device, wherein:
• a) the plurality of user equipment devices comprises at least three user equipment devices and are configured for High Speed Data Packet Access (HSDPA) operation;
• b) the indications of code allocation and modulation technique of transmission of payload data to the first user equipment device during the TTI comprise indications of code allocation and modulation technique of HSDPA transmission of payload data to the first user equipment device during the TTI;
• c) the information regarding code allocation and modulation technique of transmission of payload data to at least the second user equipment device during the TTI comprises information regarding code allocation and modulation technique of HSDPA transmission of payload data to at least the second user equipment device during the TTI;
• d) the second type of control information comprises information regarding code allocation and modulation technique of HSDPA transmission of payload data to each of the plurality of user equipment devices during the TTI;
• transmitting payload data from a first base transceiver station of the radio network to said each of the plurality of user equipment devices during the TTI on a High Speed Downlink Shared Channel (HS-DSCH);
• allocating HSDPA codes for transmission during the TTI on the HS-DSCH so that HSDPA codes associated with QPSK modulation are allocated consecutively with respect to a predetermined order of codes, and so that HSDPA codes associated with 16-QAM modulation are allocated consecutively with respect to the predetermined order, wherein the predetermined order is known to said each user equipment device;
• generating the second data portion, wherein the second data portion comprises a QPSK indication of the number of HSDPA codes allocated for transmission with QPSK modulation during the TTI on the HS-DSCH, and a 16-QAM indication of the number of HSDPA codes allocated for transmission with 16-QAM modulation during the TTI on the HS-DSCH;
• and
• allowing the number of HSDPA codes allocated for transmission with QPSK modulation and the number of HSDPA codes allocated for transmission with 16-QAM modulation to change only in every fifth TTI.

A base transceiver station in a radio network, for wirelessly communicating with a plurality of user equipment devices, the base transceiver station comprising:

• a transmitter configured to transmit payload data to the plurality of wireless user equipment devices on a first shared channel carried by a downlink carrier, and to transmit control information to the plurality of wireless user equipment devices on a second shared channel;
• and
• a processor coupled to the transmitter, wherein the processor is configured to cause the transmitter to:
• transmit to each user equipment device of the plurality of user equipment devices that is scheduled to receive payload data during a time transmission interval (TTI) a first type of control information relating to the TTI, the first type of control information comprising indications of code allocation and modulation technique of transmission of payload data to said each user equipment device during the TTI, wherein the transmitter sends different first type control information to said each user equipment device, and
• send a message to all user equipment devices of the plurality of user equipment devices that are scheduled to receive payload data during the TTI, the message comprising a second type of control information, the second type of control information comprising information regarding code allocation and modulation technique of transmission of payload data to said all user equipment devices of the plurality of user equipment devices that are scheduled to receive payload data during the TTI;
• wherein:
• the base transceiver station communicates with the plurality of user equipment devices using High Speed Data Packet Access (HSDPA);
• the first shared channel is a High Speed Downlink Shared Channel (HS-DSCH);
• the second shared channel is a High Speed Shared Control Channel (HS-SCCH);
• the indications of code allocation and modulation technique of transmission of payload data to said each user equipment device comprise indications of code allocation and modulation technique of HSDPA transmission of payload data to said each user equipment device during the TTI;
• and
• the information regarding code allocation and modulation technique of transmission of payload data to said all user equipment devices comprises information regarding code allocation and modulation technique of HSDPA transmission of payload data to said all user equipment devices;
• wherein the processor is further configured to:
• allocate HSDPA codes for transmissions during the TTI on the HS-DSCH so that HSDPA codes associated with QPSK modulation are allocated consecutively with respect to a predetermined order of codes, and so that HSDPA codes associated with 16-QAM modulation are allocated consecutively with respect to the predetermined order, wherein the predetermined order is known to said each user equipment device;
• generate a data portion, wherein the data portion comprises a QPSK indication of the number of HSDPA codes allocated for transmission with QPSK modulation during the TTI on the HS-DSCH, and a 16-QAM indication of the number of HSDPA codes allocated for transmission with 16-QAM modulation during the TTI on the HS-DSCH;
• and
• prevent the number of HSDPA codes allocated for transmission with QPSK modulation and the number of HSDPA codes allocated for transmission with 16-QAM modulation from changing more than once in every set of a predetermined number of consecutive TTIs, the predetermined number being greater than one.

A base transceiver station in a radio network, for wirelessly communicating with a plurality of user equipment devices, the base transceiver station comprising:

• a transmitter configured to transmit payload data to the plurality of wireless user equipment devices on a first shared channel carried by a downlink carrier, and to transmit control information to the plurality of wireless user equipment devices on a second shared channel;
• and
• a processor coupled to the transmitter, wherein the processor is configured to cause the transmitter to:
• transmit to each user equipment device of the plurality of user equipment devices that is scheduled to receive payload data during a time transmission interval (TTI) a first type of control information relating to the TTI, the first type of control information comprising indications of code allocation and modulation technique of transmission of payload data to said each user equipment device during the TTI, wherein the transmitter sends different first type control information to said each user equipment device, and
• send a message to all user equipment devices of the plurality of user equipment devices that are scheduled to receive payload data during the TTI, the message comprising a second type of control information, the second type of control information comprising information regarding code allocation and modulation technique of transmission of payload data to said all user equipment devices of the plurality of user equipment devices that are scheduled to receive payload data during the TTI;
• wherein:
• the base transceiver station communicates with the user equipment devices using High Speed Data Packet Access (HSDPA);
• the first shared channel is a High Speed Downlink Shared Channel (HS-DSCH);
• the second shared channel is a High Speed Shared Control Channel (HS-SCCH);
• the indications of code allocation and modulation technique of transmission of payload data to said each user equipment device comprise indications of code allocation and modulation technique of HSDPA transmission of payload data to said each user equipment device during the TTI;
• the information regarding code allocation and modulation technique of transmission of payload data to said all user equipment devices comprises information regarding code allocation and modulation technique of HSDPA transmission of payload data to said all user equipment devices;
• the message comprises (1) a second data portion, and (2) a second error detection portion masked with a common user ID, the common user ID being known to said each user equipment device of the plurality of user equipment devices;
• and
• wherein the processor is further configured to:
• computing a cyclic redundancy check (CRC) of the second data portion;
• executing an exclusive OR operation on the CRC of the second data portion and the common user ID to obtain the second error detection portion masked with the common user ID;
• and
• prevent the number of HSDPA codes allocated for transmission with QPSK modulation and the number of HSDPA codes allocated for transmission with 16-QAM modulation from changing more than once in every set of five consecutive TTIs.

A method of equalizing payload data, the method comprising:

• receiving by a user equipment device on a first downlink shared channel of a carrier a first type of control information relating to a time transmission interval (TTI), the first type of control information comprising indications of code allocation and modulation technique of transmission of payload data to the user equipment device during the TTI;
• receiving by the user equipment device on the first downlink shared channel a second type of control information, the second type of control information comprising information regarding code allocation and modulation technique of transmission of payload data to a plurality of user equipment devices during the TTI;
• configuring an equalizer of the user equipment device in accordance with the second type of control information;
• receiving by the user equipment device on a second downlink shared channel of the carrier payload data during the TTI;
• using the equalizer configured in accordance with the second type of control information to equalize and reduce inter-user interference in the payload data received by the user equipment device during the TTI;
• wherein:
• the first downlink shared channel is a High Speed Shared Control Channel (HS-SCCH);
• the indications of code allocation and modulation technique of transmission of payload data to the user equipment device comprise indications of code allocation and modulation technique of HSDPA transmission of payload data to the user equipment device during the TTI;
• the information regarding code allocation and modulation technique of transmission of payload data to the plurality of user equipment devices comprises information regarding code allocation and modulation technique of HSDPA transmission of payload data to a plurality of user equipment devices;
• the second downlink shared channel is a High Speed Downlink Shared Channel (HS-DSCH);
• the step of receiving by the user equipment device on the second downlink shared channel comprises receiving by the user equipment device on the HS-DSCH of the carrier HSDPA payload data during the TTI;
• wherein:
• the first type of control information comprises (1) a first data portion, and (2) a first error detection portion masked with a dedicated user identifier (ID) of the user equipment device, the first error detection portion being derived from the first data portion;
• the second type of control information comprises (1) a second data portion, and (2) a second error detection portion masked with a common user ID, the common user ID being known to each user equipment device of the plurality of user equipment devices;
• further comprising:
• unmasking the first error detection portion with the dedicated user ID, to obtain an unmasked first error detection portion;
• using the unmasked first error detection portion to verify integrity of the first data portion;
• unmasking the second error detection portion with the common user ID to obtain an unmasked second error detection portion;
• and
• using the unmasked second error detection portion to verify integrity of the second data portion;
• wherein:
• the second data portion comprises a first number indicating quantity of HSDPA codes used for QPSK modulated data during the TTI;
• the second data portion comprises a second number indicating quantity of HSDPA codes used for 16-QAM modulated data during the TTI;
• the step of configuring comprises programming a decision feedback filter of the equalizer to reduce interference when the first number of HSDPA codes are used for QPSK modulated data, the second number of HSDPA codes are used for 16-QAM modulated data, the HSDPA codes used for QPSK modulated data are arranged consecutively within a predetermined order, and the HSDPA codes used for 16-QAM modulated data are arranged consecutively within the predetermined order;
• and
• the step of configuring is performed only once in each TTI sequence of a third predetermined number of consecutive TTIs, the third predetermined number being greater than one.

A method of equalizing payload data, the method comprising:

• receiving by a user equipment device on a first downlink shared channel of a carrier a first type of control information relating to a time transmission interval (TTI), the first type of control information comprising indications of code allocation and modulation technique of transmission of payload data to the user equipment device during the TTI;
• receiving by the user equipment device on the first downlink shared channel a second type of control information, the second type of control information comprising information regarding code allocation and modulation technique of transmission of payload data to a plurality of user equipment devices during the TTI;
• configuring an equalizer of the user equipment device in accordance with the second type of control information;
• receiving by the user equipment device on a second downlink shared channel of the carrier payload data during the TTI;
• using the equalizer configured in accordance with the second type of control information to equalize and reduce inter-user interference in the payload data received by the user equipment device during the TTI;
• wherein:
• the first downlink shared channel is a High Speed Shared Control Channel (HS-SCCH);
• the indications of code allocation and modulation technique of transmission of payload data to the user equipment device comprise indications of code allocation and modulation technique of HSDPA transmission of payload data to the user equipment device during the TTI;
• the information regarding code allocation and modulation technique of transmission of payload data to the plurality of user equipment devices comprises information regarding code allocation and modulation technique of HSDPA transmission of payload data to a plurality of user equipment devices;
• the second downlink shared channel is a High Speed Downlink Shared Channel (HS-DSCH);
• the step of receiving by the user equipment device on the second downlink shared channel comprises receiving by the user equipment device on the HS-DSCH of the carrier HSDPA payload data during the TTI;
• wherein:
• the first type of control information comprises (1) a first data portion, and (2) a first error detection portion masked with a dedicated user identifier (ID) of the user equipment device, the first error detection portion being derived from the first data portion;
• the second type of control information comprises (1) a second data portion, and (2) a second error detection portion masked with a common user ID, the common user ID being known to each user equipment device of the plurality of user equipment devices;
• further comprising:
• unmasking the first error detection portion with the dedicated user ID, to obtain an unmasked first error detection portion;
• using the unmasked first error detection portion to verify integrity of the first data portion;
• unmasking the second error detection portion with the common user ID to obtain an unmasked second error detection portion;
• and
• using the unmasked second error detection portion to verify integrity of the second data portion;
• wherein:
• the second data portion comprises a first number indicating quantity of HSDPA codes used for QPSK modulated data during the TTI;
• the second data portion comprises a second number indicating quantity of HSDPA codes used for 16-QAM modulated data during the TTI;
• the step of configuring comprises programming a decision feedback filter of the equalizer to reduce interference when the first number of HSDPA codes are used for QPSK modulated data, the second number of HSDPA codes are used for 16-QAM modulated data, the HSDPA codes used for QPSK modulated data are arranged consecutively within a predetermined order, and the HSDPA codes used for 16-QAM modulated data are arranged consecutively within the predetermined order;
• and
• the step of configuring is performed only once in each TTI sequence of five consecutive TTIs.

A wireless user equipment device for communicating with a base transceiver station of a radio network, the wireless user equipment device comprising:

• means for receiving;
• means for equalizing;
• and
• means for processing coupled to the means for receiving and to the means for equalizing;
• wherein:
• the means for receiving is configured to (1) receive on a High Speed Shared Control Channel (HS-SCCH) of a carrier of the radio network a first type of control information relating to a time transmission interval (TTI), the first type of control information comprising code allocation and modulation technique for HSDPA transmission of payload data to the wireless user equipment device during the TTI, and (2) receive on the HS-SCCH a second type of control information, the second type of control information comprising information regarding code allocation and modulation technique of HSDPA transmission of payload data to a plurality of wireless user equipment devices during the TTI;
• the means for processing is arranged to perform steps comprising:
• configuring the means for equalizing in accordance with the second type of control information,
• configuring the means for receiving to receive on a High Speed Downlink Shared Channel (HS-DSCH) of the carrier the HSDPA transmission of the payload data to the wireless user equipment device during the TTI, resulting in received payload data, and
• using the means for equalizing configured in accordance with the second type of control information to equalize and reduce interference in the received payload data;
• and
• the means for processing is further arranged to configure the means for equalizing in accordance with the second type of control information only once in each TTI sequence of a third predetermined number of consecutive TTIs, the third predetermined number being greater than one.

A wireless user equipment device for communicating with a base transceiver station of a radio network, the wireless user equipment device comprising:

• means for receiving;
• means for equalizing;
• and
• means for processing coupled to the means for receiving and to the means for equalizing;
• wherein:
• the means for receiving is configured to (1) receive on a High Speed Shared Control Channel (HS-SCCH) of a carrier of the radio network a first type of control information relating to a time transmission interval (TTI), the first type of control information comprising code allocation and modulation technique for HSDPA transmission of payload data to the wireless user equipment device during the TTI, and (2) receive on the HS-SCCH a second type of control information, the second type of control information comprising information regarding code allocation and modulation technique of HSDPA transmission of payload data to a plurality of wireless user equipment devices during the TTI;
• the means for processing is arranged to perform steps comprising:
• configuring the means for equalizing in accordance with the second type of control information,
• configuring the means for receiving to receive on a High Speed Downlink Shared Channel (HS-DSCH) of the carrier the HSDPA transmission of the payload data to the wireless user equipment device during the TTI, resulting in received payload data, and
• using the means for equalizing configured in accordance with the second type of control information to equalize and reduce interference in the received payload data;
• and
• the means for processing is further arranged to configure the means for equalizing in accordance with the second type of control information no more than one time in five consecutive TTIs.