Scrambling sequence initial seed configuration for reference signals, data, and control channel for new radio
A scrambling sequence generation method is disclosed for reference signals, data, and downlink and uplink control channels. The scrambling sequence generation method determines an initial seed value used to calculate the scrambling sequence. The initial seed value is based on different parameters relating to the to be transmitted signals, and some of these parameters are explicitly defined for New Radio.
1. An apparatus of a user equipment (UE) comprising:
a radio frequency (RF) interface; and
baseband circuitry comprising one or more processors configured to:
scramble encoded bits using a scrambling sequence, wherein the scrambling sequence is generated using an initial seed value as input and the initial seed value is based on a Radio Network Temporary Identifier parameter and a codeword index, wherein the scrambled encoded bits comprise a bitwise modulo 2 addition of the scrambling sequence and the encoded bits, and the scrambled encoded bits are modulated using the initial seed value as input and mapped to time-frequency resources; and
send the scrambled encoded bits to the RF interface for transmission to a next generation Node B (gNB).
2. The apparatus of the UE of claim 1 , wherein the encoded bits comprise encoded data bits.
3. The apparatus of the UE of claim 2 , wherein the initial seed value is further based on a scrambling identifier (ID) for data transmission.
4. The apparatus of the UE of claim 3 , wherein the one or more processors are further configured to configure the scrambling ID for data transmission using higher layer information, wherein the higher layer information comprises one or more of minimum system information, remaining minimum system information, system information block, or radio resource control signaling.
5. The apparatus of the UE of claim 1 , wherein the initial seed value is further based on a physical cell identifier in response to a scrambling identifier for data transmission being unavailable.
6. The apparatus of the UE of claim 1 , wherein second time-frequency resources comprising a second scrambling sequence and second encoded bits are received from the gNB using the RF interface, and the one or more processors are further configured to:
descramble the second encoded bits from the received second time-frequency resources by bitwise modulo 2 addition of the second scrambling sequence and the second encoded bits.
7. An apparatus of a next generation node B (gNB), comprising:
a radio frequency (RF) interface; and
baseband circuitry comprising one or more processors configured to:
scramble encoded bits of a downlink control channel using a scrambling sequence generated using an initial seed value as input, wherein the initial seed value is based on:
a slot index parameter;
a radio network temporary identifier parameter; and
a starting symbol index of a downlink control channel transmission,
wherein the scrambled encoded bits comprise a bitwise modulo 2 addition of the scrambling sequence and the encoded bits and the scrambled encoded bits are modulated using the initial seed value as input and mapped to time-frequency resources; and
send the scrambled encoded bits to the RF interface for transmission to a User Equipment (UE).
8. The apparatus of the gNB of claim 7 , wherein the initial seed value is based on:
a physical cell identifier;
a virtual cell identifier; or
a scrambling identifier.
9. The apparatus of the gNB of claim 7 , wherein the initial seed value is based on a scrambling identifier and the one or more processors are further configured to separately configure the scrambling identifier for downlink and uplink transmission.
10. The apparatus of the gNB of claim 7 , wherein the initial seed value is based on a scrambling identifier and the one or more processors are further configured to configure the scrambling identifier for both downlink and uplink transmission.
11. The apparatus of the gNB of claim 7 , wherein the one or more processors are further configured to initialize the scrambling sequence for the downlink control channel as a function of a starting symbol for a control resource set.
12. An apparatus of a user equipment (UE), comprising:
a radio frequency (RF) interface; and
baseband circuitry comprising one or more processors configured to:
scramble encoded bits of an uplink control channel using a scrambling sequence, wherein the scrambling sequence is generated using an initial seed value as input and the initial seed value is based on one or more of:
a slot index parameter;
a radio network temporary identifier parameter; and
a starting symbol index of an uplink control channel transmission;
wherein:
the scrambled encoded bits comprise a bitwise modulo 2 addition of the scrambling sequence and the encoded bits;
the scrambled encoded bits are modulated using the initial seed value as input and mapped to time-frequency resources; and
send the scrambled encoded bits to the RF interface for transmission to a next generation node B.
13. The apparatus of the UE of claim 12 , wherein the initial seed value is further based on a physical cell identifier, a virtual cell identifier, or a scrambling identifier.