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Proposal for xHRPD Physical Layer Component Design

Proposal for xHRPD Physical Layer Component Design. Narrowband RL Channel. 6.4 KHz or 12.8 KHz RL narrowband channels. 6.4 KHz channel for Access Channel, 6.4 KHz or 12.8 KHz channels for Reverse Traffic Channel

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Proposal for xHRPD Physical Layer Component Design

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  1. Proposal forxHRPD Physical Layer Component Design

  2. Narrowband RL Channel • 6.4 KHz or 12.8 KHz RL narrowband channels. 6.4 KHz channel for Access Channel, 6.4 KHz or 12.8 KHz channels for Reverse Traffic Channel • Symbol rates 5.6 KBaud and 11.2 KBaud corresponding to channel BW of 6.4 KHz and 12.8 KHz, respectively. • Total of 192 6.4 KHz channels in 1.25 MHz CDMA spectrum

  3. RL Frame Structure • 20 ms RL frame structure consists of 112 modulation symbols for 6.4 KHz BW assignment and 224 modulation symbols for 12.8 KHz BW assignment. • Data, pilot and MAC channels are time multiplexed in 20 ms frame • Frame Structure for 6.4 KHz assignment: 94 data symbols, 14 pilot symbols, 2 RRI symbols and 2 CQI symbols • Frame Structure for 12.8 KHz assignment: 188 data symbols, 28 pilot symbols, 4 RRI symbols and 4 CQI symbols

  4. RL Frame Structure (2)

  5. Reverse Link Channels • Pilot Channel: Two types of pilots used for indicating data rate set information: Normal pilot consisting of all 0 and Marked pilot consisting of alternating ‘0’ and ‘1’. BPSK modulated. • RRI Channel: Two RRI bits used to indicate RL data rate within a rate set. BPSK modulated. • CQI Channel: Two types of CQI format used. 4-bit CQI format is same as HRPD and sent over 2 frames. 2-bits CQI format is BPSK modulated and sent over 1 frame. The CQI information is repeated over predefined period CQIPeriod. • Data Channel: Convolutional or Turbo coding, BPSK, QPSK, 8PSK, 16 QAM and 64 QAM modulation, channel interleaving

  6. RL Packet and Transmission Format • Two types of physical layer packets: voice packet and data packet. The voice packets are transmitted over single frame. Data packets are transmitted over 1 or more frames. • Transmission Format consists of 3-tuples: Bandwidth assignment in unit of 6.4 KHz (1 or 2), packet duration in number of frames, packet size in bits.

  7. Coding • Tail-biting convolutional code (CC) for 48, 96 bits encoding block size and regular (with tail) convolutional code for 192 bits encoding block size. An encoding block is a frame. • The base CC is rate ¼, constraint length 11 with generator polynomials 4656, 4726, 5562, 6372 in octal. • Rate ½ CC based on generator polynomials 4656, 6372 in octal. Rate 2/3 CC derived from puncturing rate ½ using 1x11 and 111x puncturing pattern. • Same Turbo code as HRPD for larger size packets. The encoding block is the physical layer packet.

  8. Channel Interleaving • Performed on encoded block outputs. For convolutional encoded outputs 3 different interleaver block size (192, 288 and 384) used. • Turbo encoded outputs are interleaved with same matrix interleaving method as used in HRPD

  9. RL Modulation Parameters Note *: 2 out of 96 symbols for 6.4 KHz BW assignment and 4 out of 192 symbols for 12.8 KHz BW case are punctured after channel interleaving.

  10. Forward Link MAC Channels • FL MAC channels consists of RL Power Control Channel and RL Frequency Control Channel. 1 bit power up/down command and 1 bit frequency up/down commands are sent every 20 ms resulting in 50 bps data rate for both these channels. • The following FL MAC channels of HRPD are disabled: Reverse Activity Channel, DRCLock Channel and ARQ Channel.

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