协议213,7.1.7节中，对PDSCH信道的码率有明确的限制，若超过0.93，UE可能就丢弃TB块. "The UE may skip decoding a transport block in an initial transmission if the effective channel code rate is higher than 0.930, where the effective channel code rate is defined as the number of downlink information bits (including CRC bits) divided by the number of physical channel bits on PDSCH." （1）协议是根据什么来计算出0.93这个值的？ （2）从协议上并未限制上行PUSCH的码率，那么其是否也有此限制？